Physics
Grade-9
Easy

Question

The motion which is not simple harmonic is:

  1. Vertical oscillations of a spring
  2. The motion of a planet around the Sun
  3. Horizontal oscillations of a spring
  4. Motion of a simple pendulum

hintHint:

Simple Harmonic Motion or SHM is defined as a motion in which the restoring force is directly proportional to the displacement of the body from its mean position

The correct answer is: The motion of a planet around the Sun


    Simple Harmonic Motion or SHM is defined as a motion in which the restoring force is directly proportional to the displacement of the body from its mean position. The direction of this restoring force is always towards the mean position.
    The motion of a planet around the sun is a periodic motion but not a simple harmonic motion.

    All other given motions are the examples of simple harmonic motion.

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