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You can buy your own catapult at your local Walmart for around $10.00 USD but it is more fun to build it yourself. I built mine for free since all the components I used are from recycling materials...
Step 1What you will need
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For the slingshot, try to get a V shape branch from a tree like depicted on the picture. You'll also need to large and robust rubber bands and four smaller ones. Finally I use a 1ft vinyl baseboard piece for the sling but you can use what you have such as an old leather strip from a shoe, belt etc.
for example the tee connector used in plumbling costs within $2.5 or less and the elastic $2.5 not including tax,tools and ammo unless you get into fastenners than it would cost another $2.5
here i will even throw in a video
plus the link http://www.instructables.com/id/how-to-make-a-resist-flat-slingshot/
A sling shot is a thing you use to SLING stuff. It's a piece of leather held on 4 corners/2 sides by string/sinew and used to SLING rocks by spinning it around like a lasso and releasing the rock, thus it is called a SLING SHOT. This is a CATAPULT, because it CATAPULTs things, it doen't SLING them! Get it!?
I have been trying to find a video on sling-shots but I can't find it past all the people who can't understand this simple concept.
from torque,torsion,compression and elasticity
for more info go to these links http://en.wikipedia.org/wiki/Elasticity_(physics)http://en.wikipedia.org/wiki/Torque http://en.wikipedia.org/wiki/Spring_(device)http://en.wikipedia.org/wiki/Force http://en.wikipedia.org/wiki/Tension_(physics)http://www.howstuffworks.com/force-info.htm http://www.howstuffworks.com/dictionary/physics-terms/torsion-info.htm http://en.wikipedia.org/wiki/Centripetal_force please give equal credit to the links and follow there disclaimers,terms of use and policys,laws and regulations of your area
or you can even use a elastic cloth like the kind on clothes
wow
Otherwise, better than my last attempt!
otherwise very nice.
http://img.photobucket.com/albums/v682/Threeme2189/DSC00443.jpg
http://members.home.nl/papermodels/
http://en.wikipedia.org/wiki/Sheet_bend