First slide

Rolling motion

Question

I. Speed of any point on rigid body executing rolling motion can be calculated by the expression $ν = r ω$
where r is the distance of point from instantaneous centre of rotation.
II. Rolling motion of rigid body can be considered as a pure rotation about instantaneous centre of rotation.
Which of the above statement{s} is/are correct?

Moderate

A

Only I
B

Only II
C

Both I and II
D

Neither I nor II

Solution

Statement I is correct while Statement II is incorrect.
The corrected statement is;
Every rolling motion cannot be considered as pure rotation.
For pure rotation, the condition is linear velocity, $ν = r ω$

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