where can can find free catapults plans,and material as well as instructions?

Answer 1

I have a plan for one at school that we use with the kids. If you need more details, let me know and I will bring a copy home.

2 liter bottle
4x6 index card
pencil
rubber band
plastic spoon
tootsie rolls
hole punch
scissors
permanent marker

Trace the index card on the side of the bottle, closer to the opening than the bottom of the bottle. Cut that portion out. On the sides of that opening, closer to the opening than the bottom of the bottle, use the hole punch once on each side. This is where the pencil will fit in.

Use the spoon and rubber band, with the pencil. Really we don't give the kids any more instructions, we let then figure it out. Tootsie rolls work good, also pencil top erasers if you don't want food.

They work in teams, come up with a catapult company name and jingle, the works.

Have fun with it!

Answer 2

http://www.trebuchet.com/plans.html

http://www.howtobuildcatapults.com/