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Step 9: Break it! (Or try)

This is the last step, obviously.

We decided we'd test the bridge with sand in a bucket. We bought two 60 lb bags of sand, thinking surely my bridge would break under 120 lbs.
It held 120 lbs.
We emptied the sand out, and added 40 lbs of water, then added all the sand back. It still held.

We tried the intern, and it still held.

Two days later we bought another 150 lbs of sand. The bridge finally broke under 205 lbs!

How much does yours weigh?
<p>you suck?!you caused a fire tornado lightning storm</p>
<p>Mine held 492 lbs! Anyone held that much?</p>
<p>i have held 900lbs</p>
<p>a</p>
<p>I need to make a bridge of physics!!! Now i have an idea of what i can do.</p>
<p>how long did your bridge become? </p>
<p>How about using a glue gun for steps 3-5? It dries faster!</p>
<p>Thanks for this project. Its working out great so far!</p>
<p>Is it ok to use ordinary glue? and What are those gray things on the side of the bridge to hold it up?</p>
<p>how much did your bridge weight</p>
<p>How do i comment, ive been trying so hard. I cant!!!!!</p>
<p>you are so f***ing dum</p>
<p>Why do i comment</p>
<p>Why do i comment</p>
<p>Why do i comment</p>
<p>Who the Hell do i comment</p>
<p>by comminting</p>
<p>Hoi Huntery</p>
<p>Hi Huntwer</p>
<p>010</p><p> 1</p><p> 1</p>
<p>how the hell do u make this stupid bridge!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!</p>
<p>how the hell do u make this stupid bridge!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!</p>
<p>ahhahahahahahahahhahahahahahhahahahahahahahhahahahahahhahahahahahahahhahahahahahahahhahahahhahahahaahhaaahahhahahahhhahahahaahahahhahahahahahahahahahahahahahahahahhahahaa</p>
<p>Shut up!!!!!!!!!!1</p>
<p>haha!</p>
<p>with popsicel stics</p><p>lol</p>
<p>how the hell do u make this stupid bridge!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!</p>
<p>how the hell do u make this stupid bridge!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!</p>
<p>Is it okay to use ordinary glue?</p>
<p>AWESOME thats really cool! also congrats nicholas</p>
<p>OMG THIS PROJECT WAS SOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOO GOOD I WON 1ST PLACE IN STATE AND WON 200 DOLLARS TY SO MUCH!</p>
<p>wow this is nice but i would appreciate a video of how you did it or a more detailed one.</p><p>this isn't bad its awesome !!!!!</p>
<p>This project was so awesome when I entered it in the science fair that I won 1st place and won a $100 Visa Gift Card. Yay</p>
<p>Cool design! I'm doing this for class and this would probably work super well! Thanks for the tips and info.</p>
<p>Ty! I got a perfect score because of this! </p>
<p>Thank you for this good instructions.</p>
<p>nice 1 this will help me alot..........</p>
<p>gahhhh</p>
<p>Thank you for this wonderful instructable!!</p>
I am a science/tech teacher and my kids loved this. I had the students draw blueprints prior to building the bridge. Instead of pop sticks, I used balsa wood. This is by far the best project of the year!
I'm so glad you found it so useful! Post pictures of the bridges!
what is the silver thing you used to test your bridge? What's it called and where can I find one?
<p>I could be wrong, but that &quot;silver thing&quot; looks like a slotted aluminum extrusion. They can be found here: http://www.adafruit.com/products/1302, but I'm sure you could probably find them somewhere else with a quick Google search</p>
its just a deck of cards
we did this when i was in the 8th grade only with toothpicks. its amazing how much weight those little things can hold with a little glue.
i did in 7th grade and it held 20 lbs. designed useing computer
<p>Thanks for the steps! I won the competition and won a $150 Gift Card!!</p>
WTF so strong :)
I'll be trying to make that in a Bridge Competition on 11th October, 2013.. I wish i don't mess up! :P Can you explain the (STEP 7) a bit??
i am doing a school brigde project and this is very help ful

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