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Standard XII

Physics

Introduction

Assertion :Wh...

Question

Assertion :When a body is moving uniformly in a circle, its momentum goes on changing continuously but its kinetic energy remains constant. Reason: Momentum $p = m v$ but K.E.= $0.5 m v^{2}$ . In uniform circular motion $v$ changes but $v^{2}$ does not change.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
In the circular motion the the direction of $v$ changes as the direction changes the v changes but magnitude of v doesnt change.
therefore,When a body is moving uniformly in a circle, its momentum goes on changing continuously but its kinetic energy remains constant.
but,Momentum p=mv but K.E.=0.5mv2. In uniform circular motion v changes but v2 does not change.
Hence,assertion and reson are correct and reason is correct explanation

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Assertion :When a body is moving uniformly in a circle, its momentum goes on changing continuously but its kinetic energy remains constant. Reason: Momentum p=mv but K.E.=0.5mv2. In uniform circular motion v changes but v2 does not change.

Assertion :When a body is moving uniformly in a circle, its momentum goes on changing continuously but its kinetic energy remains constant. Reason: Momentum $p = m v$ but K.E.= $0.5 m v^{2}$ . In uniform circular motion $v$ changes but $v^{2}$ does not change.