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Question

A body is whirling a stone tied with a string in a horizontal circular path. The string breaks, the stone:


A

will continue to move in the circular path

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B

will move along a straight line towards the centre of the circular path.

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C

will move along a straight line tangential to the circular path.

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D

will move along a straight line perpendicular to the circular path away from the boy.

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Solution

The correct option is C

will move along a straight line tangential to the circular path.


Explanation for correct answer:

  1. Inertia: Inertia is a property by which an object remains at the state of rest or in uniform motion unless it is acted upon by an external force.
  2. The inertia of direction: According to the inertia of direction, a body moving in a certain direction cannot change its direction unless an external force is applied on it.
  3. When the boy is whirling a stone which is tied with a string covering a circular path, then the centripetal force starts acting towards the center of the circular path.
  4. According to the question, while writing the stone the string breaks.
  5. The moment the string breaks the centripetal force acting towards the center ceases and hence no force acts on the system.
  6. So by Newton’s first law of motion, the stone will continue in a straight line and will fly off along the tangent of the circular path.
  7. Therefore, option C is correct.

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