4
Question
Work done on a body moving in a circular path is zero. Justify. [3 MARKS]
Work done on a body moving in a circular path is zero. Justify. [3 MARKS]
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Solution
Each point: 1 Mark
1. If body moves in circular path force acting on the body is perpendicular to the motion of the body.
2. Φ = 90o,
Cos90= 0
3. Work done = Force × displacement × CosΦ
= Force × displacement × cos 90
= 0
Each point: 1 Mark
1. If body moves in circular path force acting on the body is perpendicular to the motion of the body.
2. Φ = 90o,
Cos90= 0
3. Work done = Force × displacement × CosΦ
= Force × displacement × cos 90
= 0
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