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ICSE Class 10 Answered

Give an example in which force does no work on the body.
Asked by Topperlearning User | 04 Jun, 2014, 01:23: PM
answered-by-expert Expert Answer
When a body is whirled around in a horizontal circle with uniform speed, e.g. a stone tied to the end of a string,  the centripetal force at each point of the path is directed towards the centre and is, therefore, always normal to the direction of motion (which is along the tangent at that point).  Hence the work done ( W =Fs cos 90o = 0) is zero.
Answered by | 04 Jun, 2014, 03:23: PM
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