Which of the following statements is not corr | vedclass

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(B) rolling body can be imagined to be rotating about an axis passing through the point of contact of the body with the ground. Hence,the instantaneou

Vedclass · Accepted Answer

During pure rolling,the instantaneous acceleration of the point of contact is zero.

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(B) rolling body can be imagined to be rotating about an axis passing through the point of contact of the body with the ground. Hence,the instantaneous speed of the point of contact is zero. Thus,statement $(a)$ is correct. As the body is rotating,its instantaneous acceleration is not zero because the point of contact has a centripetal acceleration directed towards the center of the body. Hence,statement $(b)$ is incorrect. Once perfect rolling begins,the force of static friction does no work because the point of contact is at rest relative to the surface. Hence,work done against friction is zero. Thus,statement $(c)$ is correct. Rolling cannot take place in the absence of friction because it is the frictional force that provides the necessary torque which makes the body roll on a surface. When the inclined plane is perfectly smooth,the wheel will simply slip under the effect of its weight. Hence,statement $(d)$ is correct.

Which of the following statements is not correct?

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