Question

Work done is said to be positive when a force causes displacement:

• A. in its own direction
• B. in the direction opposite to the applied force
• C. in the direction at right angles to the direction of applied force
• D. none of the above

Answer 1

The correct option is A

in its own direction

Explanation for correct option:

Option (A):

1. Consider a situation in which applied force (F), acting on a block displaces to another position and in doing so causes a displacement (s).
2. Now as the displacement is caused in the direction of applied force, therefore work done (W) is the product of applied force and displacement.

$W=F\times s$

3. In such a situation, the work done by the applied force is taken as positive.

Hence, the correct answer is option (A).