5(a)
A stone of mass 'm' is rotated in a circular path with a uniform speed by tying a strong string with the help of your hand. Answer the following questions:
(i) Is the stone moving with a uniform or variable speed?
(ii) Is the stone moving with a uniform acceleration? In which direction does the acceleration act?
(iii) What kind of force acts on the hand and state it's direction?
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(i) The stone is moving with uniform speed.
(ii) Yes, the stone is moving with a uniform acceleration. The acceleration acts towards the centre.
(iii) Centrifugal force acts on the hand. It is directed radially outwards away from the centre.