The Energies Behind a Mousetrap Car There are a number of factors that contribute to the motion of a mousetrap car: force, speed, friction, torque, and elastic potential energy. Force is either a push or a pull on an object, which can cause the object to quicken its pace, decelerate, persist in the same place, or alter its direction. When they are in equilibrium, the net force is zero and the object does not move, since the force pulling down on it is equal and opposite to the force of the other