COMEDK · Physics · 6. Work Power Energy
When a body moves in a circular path, no work is done by the force since
- A force and displacement are perpendicular to each other
- B the force is always away from the centre
- C there is no displacement
- D there is no net force
Answer & Solution
Correct Answer
(A) force and displacement are perpendicular to each other
Step-by-step Solution
Detailed explanation
In a circular path, the centripetal force acts towards the centre of circle and the displacement is along the tangent to the circle. Hence, \(\theta=90^{\circ}\) \(\therefore\) Work done \(W=\mathbf{F} \cdot \mathrm{s}=F s \cos \theta\) \[ =F s \cos 90^{\circ}=0 \]
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