Physics-(general)
NEET Physics (general) MCQ Question
Type: MCQ-conceptual-Easy-Class 11
Which of the following statements regarding work and energy in a system of particles is correct?
A
Work done by a force is positive if the force and displacement are in the same direction.
B
Gravitational force always does positive work on an object in free fall.
C
Work done by the frictional force is always positive.
D
The work done by a constant force can never be negative.
Correct Answer
Option A
Detailed Explanation
Work done by a force is positive when the angle between the force and displacement is between 0° and 90°, as indicated by the cosine term in the work equation. In contrast, gravitational force can do negative work depending on the direction of displacement, and frictional force does negative work since it opposes motion.
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