Answer: A ball bouncing off a floor.
- A A ball bouncing off a floor
- B A mass on a spring
- C A simple pendulum (small angles)
- D A tuning fork vibrating
Correct answer: A. A ball bouncing off a floor
Explanation: A ball bouncing off a floor has non-uniform motion (impact and free fall). It is not SHM. The restoring force is not proportional to displacement.
In SHM, displacement and velocity are 90° out of phase (v is maximum when x=0, and zero when x is extreme), while acceleration is always exactly opposite in sign to displacement, consistent with a = −ω²x.
Concept context
Simple harmonic motion, spring-mass, pendulum, energy in SHM, and resonance.