Can normal force do a nonzero work on an object? If yes, give an example. If no, give reason.
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Answered by
14
Answer ⇒ Yes, the Normal Force can do the non-zero work on the Object.
Example ⇒
When the Person is moving to the top from the Elevator, i.e. against the force of the gravity, the work done by the normal reaction force is negative.
Negative work is also non-zero work since its magnitude is non the zero.
Also, When the Person is coming down from the Elevator, i.e.e in the direction of the force of the gravity, the work done by the normal force is positive.
Positive work is also the non-zero work since its magnitude is non zero.
Hence, the normal force can do the non-zero (Positive or Negative) work.
Hope it helps.
Example ⇒
When the Person is moving to the top from the Elevator, i.e. against the force of the gravity, the work done by the normal reaction force is negative.
Negative work is also non-zero work since its magnitude is non the zero.
Also, When the Person is coming down from the Elevator, i.e.e in the direction of the force of the gravity, the work done by the normal force is positive.
Positive work is also the non-zero work since its magnitude is non zero.
Hence, the normal force can do the non-zero (Positive or Negative) work.
Hope it helps.
Answered by
3
Yes. Let us consider a block A which is resting on another block B. Block B is resting on a smooth horizontal surface.
Let the coefficient of kinetic friction between the blocks be μk.
When a force F is applied on block B in the forward direction as shown in the above figure, block A moves with block B in the direction of the applied force.
The friction force on block A and the displacement will be in the forward direction.
Therefore, work done by the friction force is positive.
In this case, block A will remain in contact with block B.
This shows that static friction is doing a nonzero work on an object.
Let the coefficient of kinetic friction between the blocks be μk.
When a force F is applied on block B in the forward direction as shown in the above figure, block A moves with block B in the direction of the applied force.
The friction force on block A and the displacement will be in the forward direction.
Therefore, work done by the friction force is positive.
In this case, block A will remain in contact with block B.
This shows that static friction is doing a nonzero work on an object.
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