kinetic and potential energy
kinetic:the energy of a body or a system with respect to the motion of the body or of the particles in the system.
Newton's cartel the kinetic energy increases when you drop the ball and the kinetic energy decreases when the balls come back
potential:the energy of a body or a system with respect to the position of the body or the arrangement of the particles of the system.
holding a ball over a ledge or cliff,a rock sitting on the overhang on cliff