A pedestal fan is rotating anticlockwise. When the electric power is cut off, its speed steadily decreases to zero. Its angular acceleration will be directed :
Correct answer: C. Away from us
- A. Upward
- B. Downward
- C. Away from us
- D. Towards us
Explanation
When the pedestal fan is switched off, then its angular velocity and acceleration are anti parallel to each other. By right hand rule the angular velocity towards us while angular acceleration away from us.
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About Simple Harmonic Motion
Simple harmonic motion is oscillation in which acceleration is directly proportional to displacement and directed toward the equilibrium position. Work includes displacement, velocity, acceleration, phase, period, frequency, amplitude and energy, with applications to springs and simple pendulums. The restoring force and the conditions for SHM distinguish it from general periodic motion.
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