What is happening to the energy of an apple as it falls from a tree?

When an apple falls from the tree to the ground, its energy of position (stored as gravitational potential energy) is converted to kinetic energy, the energy of motion, as it falls. When the apple hits the ground, kinetic energy is transformed into heat energy.

Answer: The apple's energy is converted to kinetic energy as it falls. When it hits the ground, the kinetic energy is transformed into heat energy.