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NEET 2012 (AIPMT, Mains) · Rotational Kinematics & Dynamics

Rotational Kinematics & Dynamics question from NEET 2012 (AIPMT, Mains)

Q70NEET 2012 · AIPMT · MAINSEasy

Rotational Kinematics & Dynamics

A car of mass m is moving on a level circular track of radius R. If $\mu$ s represents the static friction between the road and tyres of the car, the maximum speed of the car in circular motion is given by

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Answer: (d)

On a level track, static friction supplies the centripetal force: $\frac{mv^2}{R} \le \mu_s mg$ .
$v_{max}^2 = \mu_s Rg$ (mass cancels).
So the answer is (d) $\sqrt{\mu_s Rg}$ .

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