Headline Clickable. Whether raw or cooked, food can be chock-full of dangerous bacteria long before you can smell it. Perishable food (like chicken and other meats) should be tossed if left out at room temperature more than two hours (much less if in a warm room).
Catapult physics is basically the use of stored energy to hurl a projectile (the payload), without the use of an explosive. The three primary energy storage mechanisms are tension, torsion, and gravity.
Or a fat guy even closer to the fulcrum will be lifted by a little kid on the far end. For a catapult, you can either use flexure stuff, or you can keep everything as rigid and consider it as a huge force hitting one side of a lever and suddenly stopping when it reaches a certain distance.