Which of the following statements is incorrec | vedclass

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(A) For a body rolling without slipping,the velocity of the point of contact with the ground is zero,but its acceleration is not zero. The acceleratio

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The acceleration of a point in contact with the ground is zero.

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(A) For a body rolling without slipping,the velocity of the point of contact with the ground is zero,but its acceleration is not zero. The acceleration of the point of contact is directed towards the center of the sphere and is given by $a = \frac{v^2}{R}$,where $v$ is the velocity of the center of mass and $R$ is the radius. Thus,the statement that the acceleration of the point of contact is zero is incorrect.Regarding the other options:$1$. The acceleration of the $C.O.M.$ depends on external forces; if there is no external horizontal force,$a_{cm} = 0$.$2$. Friction force is zero if the body rolls at a constant velocity on a horizontal surface without any external force,but it is non-zero if there is an external force or acceleration.$3$. Since the point of contact is instantaneously at rest,the work done by static friction on a body rolling without slipping is always zero.

Which of the following statements is incorrect for a spherical body rolling without slipping on a rough horizontal ground at rest?

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