Question

A piece of stone is tied at the end of a string is whirled in a circle with uniform speed with [3] the help of a hand. Answer the following questions: i. Is the acceleration of the stone variable or constant? ii. What is the direction of acceleration of stone at any instant? iii. What force provides the centripetal force required for circular motion?

Answer 1

Given:

A piece of stone is tied at the end of a string is whirled in a circle with uniform speed with [3] the help of a hand.

To find:

• Acceleration is constant or variable?
• Direction of acceleration at any time?
• Which force provides the centripetal force?

Solution:

• Acceleration is variable, because the direction of acceleration vector changes every $\rm in{s}tant$

• However, since this is an uniform circular motion, the magnitude of acceleration will be constant.

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• Direction of acceleration at any $\rm in{s}tant$ will be radially inwards towards the central point/axis of the circular trajectory.

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• The force contributing towards centripetal force is being provided by the hand of the operator.

• For example: The person who is revolving the stone with the string is providing a tension in the string.

• The TENSION in the string is responsible for providing the CENTRIPETAL FORCE.

$\star$ Hope It Helps.