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JAMB Physics 1997 Question 6

Question 6

Simple Harmonic Motion

Which of the following with respect to a body performing simple harmonic motion are in phase?

  1. A.Displacement and velocity of the body
  2. B.Displacement and force on the body
  3. C.Velocity and acceleration of the body
  4. D.Force acting on the body and the acceleration
Show the answer and explanation

Answer: D (Force acting on the body and the acceleration)

Explanation

By F = ma, force and acceleration always point the same way, so they are in phase. Force is opposite to displacement, and velocity is 90° out of phase with both.