When a ball dropped on the floor bounces back to a lower height:

  1. energy was destroyed
  2. gravity changed
  3. some kinetic energy was converted to heat and sound in the bounce
  4. momentum is not conserved for the ball–Earth system
Answer

C) some kinetic energy was converted to heat and sound in the bounce

The bounce was not perfectly elastic. SLO P-11-B-13 · Application

Physics MCQ · More Momentum and Collisions MCQs · Practise