Which of the following examples represent (nearly) simple harmonic motion and which represent periodic but not simple harmonic motion? General vibrations of a polyatomic molecule about its equilibrium position.

Which of the following examples represent (nearly) simple harmonic motion and which represent periodic but not simple harmonic motion? The rotation of earth about its axis.

Which of the following examples represent (nearly) simple harmonic motion and which represent periodic but not simple harmonic motion? motion of an oscillating mercury column in a U-tube.

Define simple harmonic motion.

Which of the following examples represent periodic motion?

Which of the following examples represent (nearly) simple harmonic motion and which represent periodic but not simple harmonic motion? motion of a ball bearing inside a smooth curved bowl, when released from a point slightly above the lower most point