"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.
A
Frictional force
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B
A constant force F
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C
A time varying force opposite to direction of motion
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D
Force due to a spring
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Solution
The correct option is D Force due to a spring 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 The correct option is (d)