Question
Physics Question on System of Particles & Rotational Motion
At any instant, a rolling body may be considered to be in pure rotation about an axis through the point of contact. This axis is translating forward with speed
A
equal to center of mass
B
zero
C
twice of center of mass
D
no sufficient data
Answer
equal to center of mass
Explanation
Solution
Since, in this case, instantaneous axis of rotation is always below the centre of mass. This is possible only when point of contact moves with a velocity equal to center of mass.