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Work is done on a body only when-
Answer & Solution
Correct Answer:
Option
C
Work is defined in physics as the product of force and displacement in the direction of the force.
This means that work is only said to be done when a force causes displacement of a body.
If there is no displacement, even if a force is applied, no work is done in the physics sense.
Option A is incorrect because energy gain alone doesn't confirm that mechanical work has occurred—it must involve displacement.
Option B is misleading; forces may act on a body, but without displacement, no work is done.
Option D is close, but too vague—movement alone isn't enough; it must be displacement caused by a force.
Therefore, Option C is correct because displacement is the essential condition for work to be done on a body.
This means that work is only said to be done when a force causes displacement of a body.
If there is no displacement, even if a force is applied, no work is done in the physics sense.
Option A is incorrect because energy gain alone doesn't confirm that mechanical work has occurred—it must involve displacement.
Option B is misleading; forces may act on a body, but without displacement, no work is done.
Option D is close, but too vague—movement alone isn't enough; it must be displacement caused by a force.
Therefore, Option C is correct because displacement is the essential condition for work to be done on a body.
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LoginExplanation:
In physics, work is done on a body only if there is displacement of the body in the direction of the applied force.
Simply applying a force is not enough — without displacement, no work is done.
The formula for work is:
W = F * d *costheta
Why the others are not the best answer:
A: Energy gain is a result, not the direct condition for work.
B: Forces may act without displacement (e.g., pushing against a wall).
D: Moving "through a certain distance" alone isn't enough; it must be linked with an applied force causing displacement in its direction.