A tennis ball is dropped on to a horizontal surface. As the ball bounces up and down, the height of each bounce gradually decreases. During the motion:
Correct answer: D. the total energy of the ball, ground and air is constant
- A. the kinetic energy of the ball is constant
- B. the potential energy of the ball is constant
- C. the sum of the kinetic and potential energies of the ball is constant
- D. the total energy of the ball, ground and air is constant
Explanation
The principle of conservation of energy states that the total energy of a system remains constant. The total energy includes the internal energy. The total of KE and PE at the end is 0.
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About Work and Energy
Work transfers energy when a force causes displacement, while kinetic energy, gravitational potential energy and power describe motion, position and the rate of energy transfer. The work-energy theorem links net work with change in kinetic energy, and efficiency accounts for energy losses rather than treating them as energy destruction.
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