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Question

No work is done when:

A
there is no component of force, parallel to the direction of motion
B
a nail is hammered into a wooden box
C
a box is pushed along horizontal floor
D
none of these
Solution
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Correct option is C. there is no component of force, parallel to the direction of motion
The formula for work done when the force is applied at an angle to the direction of motion is given by,
$$W = FS \,cos \theta$$
When there will be no component of force, parallel to the direction of motion then force F in direction of motion is zero, so work done will also be zero.

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