# COMMUNITY

### magnet gravity

Couldn't, with well position magnets, create an orbit around a central magnet? Almost like perpetual motion? I've been playing around with magnets lately, and I've gotten magnets to do 2 full revolutions around other magnets before coliding. Is it possible?

Posted by guyfrom7up 10 years ago

### My Theory for How Gravity Works

So I've never really found out how gravity actually works, why it happens. But a few days ago I had a epiphany. I don't know if I spelled that right. So everything is at least a little bit magnetic, even stuff like wood, no matter how little. So all of this stuff would be attracted to all the other stuff electromagnetically, right? Even a little bit? So when you get huge amounts of this stuff (I'm thinking planets here) there is enough electromagnetic attraction to pull it together, and voila! We have gravity! Plus when you have planets, there's tons of stuff like iron and other metals and metaloids, that could be very strong, magnetically. So if I'm wrong (which I probably am), can someone explain how gravity actually works to me? I'm constantly thinking about stuff like this, I get theories like this every once in a while, many of them right. But not this complicated, more stuff like figuring out how air pressure and vacuums work, but basic principle stuff.

Posted by Aeshir 9 years ago

A Virginia Tech student designed an LED lamp that is powered by gravity. It is called the Gravia, and it took second place at the Greener Gadgets competition in NYC. Gravity as a renewable energy source? Amazing!From http://pesn.com/2008/02/19/9500471_Gravity_Lamp/Concept illustrations of Gravia depict an acrylic column a little over four feet high. The entire column glows when activated. The electricity is generated by the slow fall of a mass that spins a rotor. The resulting energy powers 10 high-output LEDs that fire into the acrylic lens, creating a diffuse light. The operation is silent and the housing is elegant and cord free Ã¢â¬â€ completely independent of electrical infrastructure.The light output will be 600-800 lumens Ã¢â¬â€ roughly equal to a 40 watt incandescent bulb. Each drop of the gravity mechanism runs the light over a period of four hours.To "turn on" the lamp, the user moves weights from the bottom to the top of the lamp. An hour-glass like mechanism is turned over and the weights are placed in the mass sled near the top of the lamp. The sled begins its gently glide back down and, within a few seconds, the LEDs come on and light the lamp, Moulton said. Ã¢â¬ÂItÃ¢â¬â¢s more complicated than flipping a switch but can be an acceptable, even enjoyable routine, like winding a beautiful clock or making good coffee,Ã¢â¬Â he said.Moulton estimates that GraviaÃ¢â¬â¢s mechanisms will last more than 200 years, if used eight hours a day, 365 days a year.The winner of the Greener Gadgets competition was the Enerjar.

Posted by Brennn10 10 years ago

### Rope Faling

What would happen if you put a rope around the world and tied one end to the front of a house and one to the back of the house the held on to it and cut it on the other side (not the on your holding on to)

Posted by Slayer7 10 years ago

An article in PhysicsWorld reports on a novel technique for measuring the acceleration due to gravity. The researches used a cloud of ultra-cold atoms and bounced them off a series of upward laser pulses. By measuring the timing of the bounces they could measure g with better than 1 per mil precision.

Posted by kelseymh 9 years ago

### School Project: Gravity Car Design

Hey there guys... In my physics class we have a project in which we have to make a gravity-powered vehicle that will carry a given load along a track. The vehicle can only be powered by gravity (weights) and cannot use any other energy source such as elastics, springs, explosives, etc. I have started to make a K'nex vehicle but it is not very sturdy. The following is a picture of the rules and specifications. Much help is appreciated. ThanksFullsize Images: Front PageBack Page

Posted by RaDiKaL 10 years ago

### Mini heather-stove-combustion chamber for diesel fuel droplet

Hi word! I like to find if there is a project, or  it is made already, a mini  stove, gravity filled diesel fuel, droplet, which burn with blue flame. Not bigger than a alcohol stove made out from pepsi - bier can. Appreciated any answer about this topic. Kresimir Pregernik  dipl.ing.

Posted by KresimirPregernik 4 years ago

### Annus Mirabilis

Does anyone know where I can find a straight translation of Einstein's Annus Mirabilis? Thanks

Posted by Weissensteinburg 10 years ago

### Help me thunderclap!

Hey Everybody,  I've been humbled and surprised by all the support I've gotten on my Gravity Hook project. I'm trying something new to spread the word and I'm asking for your help to share it.   Thunderclap is a website where people come together to get the word out. Here's how it works. You visit a project and support it by clicking on buttons marked "facebook", "twitter", or "tumblr". On a certain date (March 18th in this case) the post goes out all at once.     Help me spread the word by visiting the project at http://thndr.it/1wwiz2j . Thanks! Brent

Posted by Mrballeng 3 years ago

### Floating sparkles

Hi guys! A few days ago I mixed in some sparkles with borax slime (oh, gods, the smell!) and perhaps foolishly assumed that the thickness of the slime would keep the sparkles from settling for at least a month, since they are rather light and all that. Alas, it was not to be. Four days later and most of my sparkles are at the bottom of the jar. Question: Does anybody have an idea or suggestion or anything to keep the sparkles where they are? Thank you!

Posted by TashaDax 5 years ago

### A Challenge: DIY gravity lamp

I have decided to power the lighting in my house with gravity alone starting next year. The idea started here: Greener Gadgets: Gravity LampI have some ideas about how to make it possible using some existing instructables and I though I would share this to get people thinking about new ways to use gravity as a power source. Think about it, gravity is clean, constant, eternal and EVERYWHERE. I think that this instructable has some of the essential components: Cordless Drill Crank Charge BatteriesIt gives a basic example of kinetic energy being converted into electricity, but for this application the kinetic energy will be supplied by gravity instead of the hand crank. The real fun with this project, I think, is the different ways that the kinetic energy of the weight can be harnessed. The screw used by the Gravity Lamp is just one method. A weight on a rope that is wrapped around a spool or crank is another option or even something based on the mechanism of a grandfather clock. One could even imagine a single massive weight that the whole family would hoist, with the help of pulleys, every evening to power their home lighting. Who knows.....It's time to start a gravity revolution.

Posted by PHenri 10 years ago

### Anti Gravity

SCIENTISTS in Finland are about to reveal details of the world's first anti-gravity device. Measuring about 12in across, the device is said to reduce significantly the weight of anything suspended over it.The claim - which has been rigorously examined by scientists, and is due to appear in a physics journal next month - could spark a technological revolution. By combating gravity, the most ubiquitous force in the universe, everything from transport to power generation could be transformed.The Sunday Telegraph has learned that Nasa, the American space agency, is taking the claims seriously, and is funding research into how the anti-gravity effect could be turned into a means of flight.The researchers at the Tampere University of Technology in Finland, who discovered the effect, say it could form the heart of a new power source, in which it is used to drive fluids past electricity-generating turbines.Other uses seem limited only by the imagination:Lifts in buildings could be replaced by devices built into the ground. People wanting to go up would simply activate the anti-gravity device - making themselves weightless - and with a gentle push ascend to the floor they want.Space-travel would become routine, as all the expense and danger of rocket technology is geared towards combatting the Earth's gravitation pull.By using the devices to raise fluids against gravity, and then conventional gravity to pull them back to earth against electricity-generating turbines, the devices could also revolutionise power generation.According to Dr Eugene Podkletnov, who led the research, the discovery was accidental. It emerged during routine work on so-called "superconductivity", the ability of some materials to lose their electrical resistance at very low temperatures. The team was carrying out tests on a rapidly spinning disc of superconducting ceramic suspended in the magnetic field of three electric coils, all enclosed in a low-temperature vessel called a cryostat."One of my friends came in and he was smoking his pipe," Dr Podkletnov said. "He put some smoke over the cryostat and we saw that the smoke was going to the ceiling all the time. It was amazing - we couldn't explain it."Tests showed a small drop in the weight of objects placed over the device, as if it were shielding the object from the effects of gravity - an effect deemed impossible by most scientists."We thought it might be a mistake," Dr Podkletnov said, "but we have taken every precaution". Yet the bizarre effects persisted. The team found that even the air pressure vertically above the device dropped slightly, with the effect detectable directly above the device on every floor of the laboratory.In recent years, many so-called "anti-gravity" devices have been put forward by both amateur and professional scientists, and all have been scorned by the establishment. What makes this latest claim different is that it has survived intense scrutiny by sceptical, independent experts, and has been accepted for publication by the Journal of Physics-D: Applied Physics, published by Britain's Institute of Physics.Even so, most scientists will not feel comfortable with the idea of anti-gravity until other teams repeat the experiments. Some scientists suspect the anti-gravity effect is a long-sought side-effect of Einstein's general theory of relativity, by which spinning objects can distort gravity. Until now it was thought the effect would be far too small to measure in the laboratory.However, Dr Ning Li, a senior research scientist at the University of Alabama, said that the atoms inside superconductors may magnify the effect enormously. Her research is funded by Nasa's Marshall Space Flight Centre at Huntsville, Alabama, and Whitt Brantley, the chief of Advanced Concepts Office there, said: "We're taking a look at it, because if we don't, we'll never know."The Finnish team is already expanding its programme, to see if it can amplify the anti-gravity effect. In its latest experiments, the team has measured a two per cent drop in the weight of objects suspended over the device - and double that if one device is suspended over another. If the team can increase the effect substantially, the commercial implications are enormous. Okay. lets throw down our ideas and see if we can figure something out... or not

Posted by RelyNupon 10 years ago

### If you're standing on the Moon holding a pen, and you let go

Thought this deserved some looking at:can you answer these questions right?13. If you are standing on the Moon, and holding a rock, and you let it go, it will:(a) float away(b) float where it is(c) move sideways(d) fall to the ground(e) none of the above25. When the Apollo astronauts wre on the Moon, they did not fall off because:(a) the Earth's gravity extends to the Moon(b) the Moon has gravity(c) they wore heavy boots(d) they had safety ropes(e) they had spiked shoes My prediction is that most of you will get the question right, as instructables is a scientific community.Check the link for detailshttp://www.phys.ufl.edu/~det/phy2060/heavyboots.html

Posted by flio191 9 years ago

### An Exploratory Research Mechanism

Designed and Built by Emile Cole Range of Motion Video (profile).... http://www.youtube.com/watch?v=P_vF3...layer_embedded Range of Motion Video (front).... http://www.youtube.com/watch?feature...&v;=E7CEwnOFnCk   Hello all.... I've been working on this (hobby status) on and off over the last fifteen years or so.... a mechanism that immediately begins to rotate in either direction with an imbalancing displacement of as little as one degree. With repeated periodic displacements of as little as five to seven degrees its rate of rotation rapidly approaches about a 100 to a 150 rotations per minute over the course of just eight to ten repetitions, all while overcoming only negligible frictional resistance from the main axel (equipped with bearings). It may have some applications for extracting rotational motion more efficiently from wind and wave and maybe a couple of other things too.... or it may just be a work of art.

Posted by EmileCole 5 years ago

### Anti Gravity ramp - REVEALED

Here is an awesome illusion that took me around half an hour to make and film and edit. Enjoy =)

Posted by Hiyadudez 8 years ago

### Possibility of "gravity chamber" becoming a reality

I used to watch the show  "Dragon Ball Z" when I was younger, on some of the episodes there was a gravity chamber which would increase the gravity in the room. It would go up to 450G (1G= 1 times the Earth's gravity) I know this is completely impossible but could a device like this even exist and if it did would make it to 2G's? Before you respond I know this is just a show and not reality. If this did work this would help athletes train and astronauts (if and when the moon is colonized)

Posted by crc09 7 years ago

### Anti Gravity Idea...

OK I had this idea. I was online and thought up this idea for an anti gravity machine. This is it: use extremely static negatively charged materials for anti gravity. It could work the same way lightning clouds do. The base of the cloud is negatively charged and the ground become positively charged. Now if the material of the anti gravity "thing" is charged with static electricity, wouldn't it repel the ground? Now I am by far no expert in any of this...I just thought it up. What do you guys think?

Posted by bcarl6 9 years ago

### Anti-gravity Machine concept

This is a concept I came up with for an idea of an anti-gravity machine.  Let me just state for the record... I do not think this will actually work.  However, while I am quite certain this idea should not work... based upon my limited knowledge of science... it would seem like it could work.  Unfortunately I know I am never going to spend the thousands if not millions of dollars to build this concept to find out. The basic premise of the idea is the use of angular momentum to overcome the force of gravity.  Imagine if you will, a gyroscope spinning at such a high velocity that its outward force overcomes the downward force of gravity.  Naturally, one of the big obstacles is generating the speeds necessary to create the velocity such that angular momentum is greater than downward force. What I essentially propose is a spinning ring that is propelled in the same way as a maglev train.  Using Electromagnetic propulsion or EMP to accelerate a ring in a vacuum by the utilization of a flowing electrical current and magnetic fields may in theory generate the speeds necessary for the force to overcome gravity.  Unfortunately, the power to run such a vehicle and the weight to power ratio are significant obstacles. Two of these rings above one another I theorize can create tremendous propulsion if the angles of the rings were changed.  Using hydrolics to change the angle of alignment of these two rings may create incredible forward momentum.  Once more, such a vehicle would not be limited to operation within Earth's atmosphere unlike jet or other propulsion mechanisms.  In fact, it should operate at peak efficiency in a zero gravitational environment. This is all theory... and I'd love to know if it is indeed as crazy as it sounds.

Posted by DarkRubyMoon 8 years ago

### Iron Man 2 Kinetic Sculpture?

For those who have seen Iron Man 2: In that one scene where Tony is in an office with Pepper on the desk there's that sculpture on her desk. I did some research (A.K.A googling it) and found that it's called the Swinging Stick Sculpture. Do you think its possible to construct one out of wood? It would be so awesome :P

Posted by squirrelMLM 8 years ago

### Gravity Car Wheel Size

I have built several adult soapbox derby/ Gravity cars. I'm working on a new build that may require a smaller front tire, such as a 16inch tire. My plan is to run 2 26inch rear wheels and 1 16 inch front  wheel, with a total car weight of 225lbs.   Since there is no gearing, just gravity, and just considering size, will smaller front wheel effect my speed? Thank you

Posted by hos13 3 years ago

### First bolt action without gravity fed hopper?

I made this true bolt action that works like the real one . instead of using gravity to put the bullet in the chamber , mine uses a ramp . Another thing new about this is the magazine is easy to remove , just press the button behind the magazine , just like the AKs , and remove the magazine .

Posted by Katarukito 9 years ago

### Will it centrifuge?

I have recently obtained a desk-top centrifuge which has yet to be used. It takes tubes with a volume of 1.5ml, and subjects them to accelerations of up to 8500 gravities (by comparison, most theme park rides top out at 5 gravities).So - what should I put in it?I plan to collect ideas and then spend an evening or a weekend in the shed...Edit:First results are in.Blood!The Club Edition

Posted by Kiteman 10 years ago

### Sealed gravity liquid dispenser

I am looking to build a sealed gravity dispenser similar to this one.... http://www.dudeiwantthat.com/household/bar/liquor-log-booze-dispenser.asp I'm trying to figure out the best route to take, I have a beer tap I will be using. My problem arises with running plumbing in a solid piece of wood without cutting it in half. I plan to use pvc and but that means I need a 90 degree angle in the block of wood or log. Is it possible? My best idea is to drill my holes and cut a chunk out of the back that can be glued back. My next question is. How to attach a bottle? Obviously I have to have the bottle upright and place the dispenser on the bottle and flip it. But how to get a seal on the bottle that will work with different bourbon or whiskeys. Thanks on advance for any help.

Posted by AndyB107 2 years ago

### Tactics for a Knex Halo War

Marine: Assault Rifle, SMG, Battle Rifle. Covenant Elite: Plasma Rifle, Needler, Energy Sword, Covenant Carbine. Grunt: Plasma Pistol, Needler, Plasma Rifle. Jackal: Plasma Pistol, Plasma Rifle. Jackal Sniper: Plasma Pistol, Beam Rifle, Gravity Rifle. Brute: Brute Shot, Brute Spiker, Brute Plasma Rifle, Brute Mauler, Gravity Hammer. Hunter: M6C Magnum. Master Chief: take any guns that you want

Posted by SonicX 22 8 years ago

### Gravity Lamp Calculations

Http://www.core77.com/competitions/greenergadgets/projects/4306/ some people might recognize this little invention a while ago.  Well I recently wanted to make one after a freak snow storm rocked central pennsylvania (didn't have power for 2 days, it sucked balls).  But, after doing the math, his claims seem impossible.  Someone check the math for me: Facts of the Gravity lamp (with data in favor of the lamp_: output: 600 lumens weight falling: 50 pounds distance falling: 58 inches (in reality it's a bit shorter, but i'm just putting everything in favor) for ease of calculation and in favor of the lamp, assuming 100% efficiency. lasts for 4 hours calculations: 600 lumens = 7542 candellas = 7542000 mcd the highest efficient LEDs i could find output 120,000mcd at 20mA (0.02 amps) with a drop of 3.2 volts 7542000mcd/120000mcd = 63 LEDs 1 LED = 3.2 volts * 0.02 amps = 0.064 watts 63 LEDs = 4 watts 50 pounds = 22.68 kg on earth: the force of the weight is 22.68*9.8 = 222.264 newtons 58 inches = 1.47 meters 1 joule = 1 watt * 1 second = 1 newton * 1 meter 222.264 newtons * 1.47 meters = 326.73 joules 326.73 joules / 4 watts = 81 seconds, NOT 4 hours looking back at it, I think i messed up the calculations at earth's gravity, because that part is just totally wrong :P.  I'm not far enough into my physics class to know how to properly calculate that, could someone else?

Posted by guyfrom7up 8 years ago

### How to make a cHAllenge? 0g Spacial Arch with clay concept

How do i sign in for a challenge? you know other websites were I could advertise this? like meetups events , other? I want to start a cloud for design concepts for 0 gravity Architecture - no straight walls

Posted by DIAGONALLIS 11 months ago

### Propulsion Engineer

I want to design new propulsion systems that don't need to use combustion, what should I major in, I was thinking of majoring  in Aerospace engineering and minoring in Electrical engineering. Any suggestions? p.s. the propulsion includes, but is not limited to: anti-gravity/warp-drives  (Which physics says is plausible)

Posted by monkhm 7 years ago

### airplane without fuel from petroleum

This is airplane without fuel from petroleum . It is operated by new material,optical technology, complex energy. major energy are using solar energy and motors are 7 type. not only the mekanism is extremly different but also it is free -gravity. It is doing investigation and required more experiment.

Posted by arsmuv 10 years ago

### Interstellar (movie) ScienceFiction

Spoiler alert. The butler did it!!  Just kidding.                 Category: Weird Planets! Water Planet-  How'd they know that the sea was shallow enough to land in? The ship's engines apparently can't run if wet. So landing here was pretty risky. Would you land a plane in a foot of water not knowing if it was 1000' of water? You can't take off if the engines are wet!                         When a big wave hits, (on earth) one of the signs is that the water in a bay will recede. Why didnt this happen when the big waves hit in the film?   Ice Planet-  80% of earth's gravity (IIRC)  Yet a "frozen cloud" can hold up it's own weight. Fun world, very sculptural. Is there any way these shapes can hold themselves up?  Might be more believable if planet had 10% of earth gravity.  Those jump jets also more plausible in low G.                 Category: Black Hole Appearance-  At first, this seemed pretty artsy- bizzare. But i'd read that lots of research + computer modelling went into it. So here's my assumtion explaining the visual:  The black hole has a simple ring of hot debris orbiting it like the rings of saturn. This stuff isn't close enough to have it's light sucked in. Looking above, or below the "hole", Light from the backside of the ring is bent around to our "eyes" by gravity. This causes the illusion of a second ring perpendicular to the first one. If we coud "look"  with some means unaffected by gravity, we would "see" a single ring.                 Category: Demise of Earth IIRC, the crop  blight is "using up" the N2 in the atmosphere??  um...  Overall, a really good flick, addressing big human questions. Of course the human story is the most important, tough decisions face these characters....  but chat on sci should be fun, too.

Posted by Toga_Dan 3 years ago

### Phun -- "Coolest science toy ever?"

Phun - the 2D physics sandbox, has been called the "Coolest science toy ever" by the folks at Bad Science.Phun is a neat little physics simulation environment with gravity rules, etc., and a very simple real-time interface. Try it!The free download is here.

Posted by gmoon 10 years ago

### wanted: how to build a dc rectifier for neon sign transformers

Please help me build a dc rectifier for a 10 kv neon sign transformer. i need it to be dc becouse im building an anti-gravity lifter and those dont work with ac

Posted by budsiskos 9 years ago

### Old iMac Stand - Project ideas??

Ok, so i had one of those impulse buys.. I purchased a spare iMac aluminum stand (pictured). I was going to use it to attach to the back of my monitor, but the stand would have to fit below the center of gravity for said screen (see second picture) So, any ideas/advice?

Posted by gmjhowe 9 years ago

### Solar, Wind, or Water Power: What is your green energy source?

From solar to aquatic, what are your forms of renewable energy? Any new ideas? I know another post in the "Green" topic talked about a gravity-powered LED lamp. What next?

Posted by KKremke 4 years ago

### Extreme Wig Styling Instructable

I have been searching around looking for a tutorial on how to create an extreme wig hairstyle similar to Ophelia Overdose's wig stylings. Example I have seen a lot of tutorials about adding hair to existing synthetic wigs, but I haven't seen much on creating large gravity defying hair that includes curls.

Posted by kimmydesigns 6 years ago

### Ball counter or weight sensor with relay to sound alarm or trigger 9v confetti cannon

Anyone interested in a bit of work...I could also run it as a competition. Apologies in advance if what I am doing in not allowed on instructables, but I couldn't find a place to offer this work. Peoplehour does not specialise in tech gadgets! I am a one man band training business in the UK. I am trying to find someone to make this gadget to work with my Gravity Ball Game. Gravity Ball is a two hour team building activity. Gravity Ball requires teams to design and build a construction capable of transporting a ball from one zone to another; the ball must roll freely along the construction using gravity only. There will be a shared zone that will require team collaboration, co­operation and coordination. Everyone needs to contribute to the overall team objective whilst ensuring their own structure functions to a specific brief and works correctly. All teams will release their designated ball (tennis ball, golf ball, cricket ball, squash ball. Etc.) at the same time. Each team ball will roll freely along the team structure, into the shared area and the fall into a collection container. When all the balls are in the container (and a specific weight achieved) then the Weight sensitive relay switch will detonate a electronic confetti cannon. Alternatively, an infra red or sensor can count the number of balls that pass at a particular point and when the designated number is reached, the confetti cannon will detonate The detonation will give a wow factor to the team activity. Considerations: I need a gadget, Arduino, raspberry pi or beaglebone that can measure or count the number of ball and then detonate a confetti cannon or sound an alarm • Programmable weight or ball counter setting • Maximum weight 300g-400g or Maximum number of passing balls is 10 • Work with standard electronic confetti cannon from Confetti Masters, alarm or Siren (http://www.confettimaster.com/streamer.electric.confetti.cannons.html) or Showtec electric cannons (http://www.sblite.co.uk/598-80cm-multicolour-electric-confetti-cannon.html) Message me if you are interested! Kind regards Canute

Posted by GreenflashUK 3 years ago

### A fountain that does NOT run on electricity

I know it is possible to build a fountain that runs on gravity and water pressure, but I'm not sure how to go about making one. I understand that you can't get something from nothing, and I'm not looking for a fountain that would run endlessly. If someone could show me the basics of how such a font might work, I would greatly appreciate it.

Posted by Trigonography 7 years ago

Hey guys. Im trying to make a homemade airsoft gun, and have many ideas about it but im stuck on one thing. How does the BB stay in without rolling. If i have a magazing, as long as the pellet doesn't move i can have a gravity/spring fed magazine without a problem. someone please help! How does the pellet not roll in the barrel when it is chambered and ready to go? thanks, tristan

Posted by guitar-is-awesome 7 years ago

### Electric Power Generation and Resistance Questions

Okay so I understand the basic concepts of power generation but I have a question pertaining to the old addage: An object in motion tends to stay in motion. Resistance is power that stops any said object if it is equal to the energy of the object in motion - this resistance is from gravity and other outside forces acting upon said object. OKAY If the force to put an object in motion was then then collected by electrical generators from multiple other sources as part of the same object - would it be able to make up for the amount of resistance from the added collection and the amount needed to put said object into motion and keeping it in motion???? If an object is designed to be in motion then it does not require as much energy to stay in motion as it does to be put in motion. Even when affected by gravity, as it is affected by gravity less when is in motion. But can technology (bearings and rotors) be designed so they offer less resistance than the amount of energy required to keep said object in motion? This is impossible as far as I am aware. Energy is NOT free - but If the energy required to keep an object in motion is less than required to put it into motion, would not the true energy of the object in motion be greater than what is required to keep it in motion and be able to be collected as excess energy? Collection would result in resistance however and since the formula of "greater or equal force" applies collecting anything other than that differential in energy would result in the objects motion being slowed. Is this true? I am concerned about going into details on the nature of my concept until I can gain a better understanding of the science behind it. As such I apologize for how vague my questioning is.

Posted by Tetsuoh 2 years ago

I am concerned about the health of my son because he spends a lot of time playing computer games.I want to make for him a workstation with adjustable tilt of the chair and monitor as in Altwork Station or Human Touch Zero Gravity Chair, but without  complicated electric mechanisms. Unfortunately the price of such things in Ukraine is incredibly expensive, so I want to do it myself. Can someone help with ideas or plans ? Tnx Google translater was used

Posted by Kirini 10 months ago

### Nerf Hyper Sight Lock 'n' Load Airsoft Mod Help

I'm starting to hate gravity... I think every geek goes through that phase at least once in their life. Anywho, I just modded my Nerf Hyper Sight Lock 'n' Load gun to fire airsoft pellets, but is there a way to prevent pellets from rolling right out the barrel when the barrel is less than parallel to the ground? Any help is greatly appreciated.

Posted by lupinesoul 10 years ago

### The Assassins Creed Hidden Dagger

Altair ,the protagonist of the game Assassins Creed has a hidden dagger attached to his arm which is obviously spring loaded, but he unsheaths it by pressing a button with his pinky and retracts it with the same. I wanted to know if it is possible to make such a contraption and how it would work just to satisfy my curiosity. There are a number of videos on youtube but most of them are gravity driven or do not give any explaination so I'd be obliged if someone helped me out with this.

Posted by blckthng 10 years ago

### Help to make a self watering drip irrigation system (using an air well+gravity pressure drip irrigation)

Hello, lately I have become interested in DIY drip irrigation systems and have begun building one myself. The I started thinking:" wouldn't it be great if I didn't have to manually fill up the tank?" and remembered that there was already a very low tech way to get water: the air well!! Well, why not put the two things together? The air well collects the water and then this is distributed to the plants through the drip irrigation system. Obviously people have already thought about this (here's a link to a great project http://www.bustler.net/index.php/article/airdrop_irrigation_wins_first_prize_at_2011_james_dyson_awards/), but I was thinking if there was a way to build something even less technological, i.e. with no pump (I would rather use gravity instead) and no special condenser, but rather something made from recycled/easy to get parts. After all I don't live in a desert, so a less efficient system would do just fine. It's just so that I don't have to carry heavy buckets of water to quench the thirst of my synergic garden. Cheers

Posted by wilson14 6 years ago

### Common water insoluble powders to use as heatpipe wick.

I'm wanting to make a heatpipe which works against gravity and so am looking for commonly available materials to use as a wick. Like a sugarcube on a spoon soaking up coffee. Except that since I'll probably be using water as my working fluid, the wick will need to be insoluble in water, as well as heat proof to a couple hundred degrees. A few things I've thought of to try are flour, talcum powder, chalk dust and sand. Thoughts?

Posted by SolarFlower_org 8 years ago

### Help to make a self watering drip irrigation system (using an air well+gravity pressure drip irrigation)

Hello, lately I have become interested in DIY drip irrigation systems and have begun building one myself. The I started thinking:" wouldn't it be great if I didn't have to manually fill up the tank?" and remembered that there was already a very low tech way to get water: the air well!! Well, why not put the two things together? The air well collects the water and then this is distributed to the plants through the drip irrigation system. Obviously people have already thought about this (here's a link to a great project http://www.bustler.net/index.php/article/airdrop_irrigation_wins_first_prize_at_2011_james_dyson_awards/), but I was thinking if there was a way to build something even less technological, i.e. with no pump (I would rather use gravity instead) and no special condenser, but rather something made from recycled/easy to get parts. After all I don't live in a desert, so a less efficient system would do just fine. It's just so that I don't have to carry heavy buckets of water to quench the thirst of my synergic garden. Cheers Another cool thing to make would be a poor man's version of this http://www.groasis.com/en

Posted by wilson14 6 years ago

### Drinks can Stirling engines (UK & EU only)

These are simple coke can Stirling engines that run on one or two candles. Made from recycled coke cans, tuna cans and bottle lids. They are of a simple gravity driven design that using fishing line to connect the displacer. Each on is made by me and slightly different, so the pictures are guidelines only. Please not these are just models will not power anything useful (as far as I'm aware!).  They are £8.99+ £1.98 shipping. For more details, see my site here. (video shows slightly older version, these run the same though)

Posted by scraptopower 7 years ago

### Oil Burning Stove - Waste Vehicle Oil Stove - WaterHeater - Outside Oil Fueled Furnace

I am looking for a decent incarnation of a oil burning stove/furnace/heater. My issue is this....when I load up my woodstove for the day, my house is cold when I return 9hrs later. I recall my father had a gravity fed waste oil stove/heater in his mechanics garage. he did not have to go feed it like his coal/woodstove. Thanks!

Posted by Tolting 4 years ago

### BAP-31v1.4 (True Bolt Action Pistol)

Here is my true bolt action pistol. It is pretty small for a true bolt action but pretty big for a pistol. It is also pretty ugly but it has to be like that with the mag because it uses gravity to operate. The trigger is TheDunkis' trigger from the TDS2. Pics: 1:The gun 2:TheDunkis' trigger 3:Firing pin and bolt forward 4:Firing pin and bolt back 5:Firing pin back and bolt forward 6-8:Internals

Posted by jollex 9 years ago

### Nice paper: Constraints on possible &quot;antigravity&quot; of antimatter

A new preprint on arXiv does an excellent job of deriving strong constraints on the possible "antigravity" (gravitational repulsion) of antimatter, based on very precise experimental data and a minimum of theoretical assumptions. Karshenboim goes through several complex and detailed analyses to set tight limits on antigravity effects.The argument I like best goes as follows: if antimatter feels a gravitational repulsion relative to matter, then "pure neutral" bodies, like positronium (bound states of e+ and e-) or photons (which are their own antiparticles) should feel no gravity at all. That trivially contradicts the gravitational deflection of light, and therefore can't be true.

Posted by kelseymh 9 years ago

### Calling All Ball Machiners And Knex People! Challenge

I play ping pong ALOT, but since my brothers moved out to college I can't play anymore. I've looked all over the Internet but I can't find any knex ping pong ball thrower/shooter/whatever. So the challenge is (since I can't make one) to create an automated (gravity or motor powered) ping pong ball thrower preferably out of knex. It would be greatly appreciated. Here's some inspiration if you want itHomemade ping pong ball thrower

Posted by sc lightning 9 years ago

### what would this stepper controller pinout mean?

I salvaged the interesting bits from two gravity fed laserprinters recently, and was delighted to find the stepper motors have small driver boards mounted to them.  Unfortunately, i dont know much about steppers or their drivers.  I'm hoping somebody with more familiarity can point me in the right direction to figuring these out. They are 13.9W 24V steppers, and manually rotating them i can feel 24 jumps, so im guessing they rotate 24 steps per revolution. The pins on the driver are LD, CW, START, GND, DC24V.  Aare those common pins for a stepper driver?

Posted by Kyle_S 6 years ago