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JEE PHYSICS MCQ: SYSTEM OF PARTICLES

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Analyzing +4 | -1

Assertion: Practically a body rolling on a surface will loose its complete K.E.
Reason: Friction will convert its K.E. into P.E. of atoms.

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Correct option: A

If both Assertion & Reason are True & the Reason is a correct explanation of the Assertion

Option A (If both Assertion & Reason are True & the Reason is a correct explanation of the Assertion) is correct because rolling motion eventually ceases due to friction converting kinetic energy into internal energy (heat) of the atoms in the surfaces.

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are related as : A solid metal ring and a disc of same radius and mass are rotating about their diameters with same angular frequency. The ratio of their respective rotational kinetic energy values is When a torque acting upon a system is zero, then which of the following will be constant A point particle of mass

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is rotating in a circle of diameter

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. Its moment of inertia will be The angular velocity of a particle is given by

\omega = {t^4} + 2{t^3}

then its angular acceleration of the particle at

t = 1\,sec

\left( {rad\,{s^{ - 2}}} \right)