would a metal spring get tired? no, is it exerting a force? yes.
its not actually doing anything, so it isn't using energy. It has only potential energy, and it keeps it until released from the wall.
Ok, say there was no friction at all, when the two ships snag the rope, and stop, where...
yes i think i am confused with what force, kinetic energy, momentum, and energy are. i sometimes use them interchangably. but there is still a problem that i will try and outline. a force pushing left will cancel out a force pushing right, so there will be no energy used. I was using the...
actually the energy is used in stopping the cars, one car exerts a force on the other car with enough force to stop the car, and vise versa, so each take the other cars energy to change their momentum. That makes perfect sense to me, but then what happened to the momentum?
momentum is...
i might be wrong but i think i have thought of another place the energy might go. back to the car slowing down 5km, its tires exert a force on the ground, pushing whatever is under it in the same direction of its movement, so the slight momentum of the car could be transferred to the momentum...