Buy a kit at a hobby shop for the quickest and safest route.
OR if you are the adventurous type...
see the links below for a build-it-yourself catapult. Always remember to have an escape plan should the catapult work really, really well. :-) ---- u could go 2 this website they give u a really easy wayhttp:/www.buzzle.com/articles/a-great-project-for-kids-make-a-catapult.html
A simple way to build a catapult for kids to play with would be to use the seesaw as a model. A seesaw with a basket on one side to hold what is going to be flung would be perfect as a catapult.
The best way to build a catapult successfully is to use quality components based on a reliable design. This will ensure the device works effectively and safely.
You don't.
on waterfall mountain
read the instructions
In order to build a catapult you need a way to store energy. A spring, a bungee cord ect. In the medieval days they used tightly wound rope. I cannot see a way to store energy with a coat hanger.
their was nothing else
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ancient Greece and Rome
to make the work easy.
put a lot of supports on it
Build a catapult. Launch things at them.