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 its direction?

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Solution

(i) The stone is moving with a uniform speed.
(ii) Yes, the stone is moving with uniform acceleration. The acceleration acts along the tangent drawn at that point of the circle.
(iii) Centrifugal force acts on the hand and it is acting away from the centre of the circular path.

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(i) The stone is moving with a uniform speed.(ii) Yes, the stone is moving with uniform acceleration. The acceleration acts along the tangent drawn at that point of the circle. (iii) Centrifugal force acts on the hand and it is acting away from the centre of the circular path.

(i) The stone is moving with a uniform speed.
(ii) Yes, the stone is moving with uniform acceleration. The acceleration acts along the tangent drawn at that point of the circle.
(iii) Centrifugal force acts on the hand and it is acting away from the centre of the circular path.