Describe two other examples in which an object's energy is transformed back and forth between gravitational potential and kinetic energy.

Roller Coaster Ride: A roller coaster is a perfect example of the transformation between gravitational potential energy and kinetic energy. At the highest point on the track, the roller coaster has maximum potential energy. As it starts to descend, this potential energy is converted into kinetic energy, making the roller coaster move faster. When it reaches the bottom and starts to ascend again, the kinetic energy is converted back into potential energy. This cycle continues throughout the ride.

Pendulum Swing: Another example is a pendulum swing. When a pendulum is lifted to one side, it gains potential energy. As it is released and starts to swing down, this potential energy is converted into kinetic energy. At the lowest point of the swing, the pendulum has maximum kinetic energy and minimum potential energy. As it starts to swing back up, the kinetic energy is converted back into potential energy. This back and forth conversion of energy continues until external forces like air resistance and friction cause the pendulum to come to a stop.