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Question

"The motion of a particle with a restoring force gives oscillatory motion". Which of the following force can be a restoring force for the oscillatory motion.
  1. Frictional force
  2. A constant force F
  3. A time varying force opposite to direction of motion
  4. Force due to a spring

A
Frictional force
B
A constant force F
C
A time varying force opposite to direction of motion
D
Force due to a spring
Solution
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Frictional force is a constant force acting opposite to the direction of motion
A constant force only makes an object to move in one direction
A time varying force makes an object to move in one direction with its speed increasing
Force due to a spring, keeps varying, as the object is moved away from its mean position and thus acts as a restoring force

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