Catapults are used to launch things.
Catapults are able to launch objects as far as 500 to 1,000 feet, which is from 150 to 300 meters. It is surprising how much energy a catapult can store an release. The gears are important because they create a winch and the winch allows a person to put a great deal of energy into the catapult over a period of time. Then all of the energy releases at once, throwing the projectile.
The purpose of catapults is 2 launch objects at enemy,someone,or anything just 2 have fun!!!