Imagine you're standing on a skateboard and your friend pushes you to the left with a force of 100 N. Neglecting friction and air resistance what will your friend need to do to make you come to a full stop

This energy transformation diagram represents the energy of a skateboarder moving along a half-pipe. as she skates toward the top of the half-pipe, her original kinetic energy is converted to potential energy and friction. how much of the energy is potential?