Day 2: Catapult Energy
Picture Source: https://ahutton8.files.wordpress.com/2011/09/catapult.jpg
I have tried many times to launch a rock while using a catapult but it seems conservation of energy does not work, instead of transferring the energy to the rock, it transferred it to the rest of the catapult. The potential energy from the counter weight applies a torque force downward forcing the other side of the fulcrum to swing, since momentum is conserved and the rock is smaller than the counter weight, the rock accelerates the x direction.