A stone attached to one of string is revolved around a stick so that the string winds upon the stick and gets shorted. What is conserved?

angular momentum

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liner momentum

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kinetic energy

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none of the above

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Solution

The correct option is A angular momentum
As the string wind upon the string, length of the string gets shorter and the angular velocity will increase. But the angular momentum remain conserved.

$\to L = m v r = m r ω^{2} = constant$

As the radial distance decrease, angular velocity will increase.

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Figure

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A stone attached to one of string is revolved around a stick so that the string winds upon the stick and gets shorted. What is conserved?

The correct option is A angular momentumAs the string wind upon the string, length of the string gets shorter and the angular velocity will increase. But the angular momentum remain conserved. →L=mvr=mrω2=constant As the radial distance decrease, angular velocity will increase.