First slide

Rolling motion

Question

The string of a step rolling wheel is pulled by applying force F with different lines of action in two situations as shown. The wheel starts rolling without slipping due to application of the force.

Difficult

A

The wheel rolls to the right in situation I and to the left in situation II.
B

The wheel rolls to the left in situation I and to the right in situation II.
C

The wheel rolls to the right in both situations.
D

The wheel rolls to the left in both situations.

Solution

(Pure rotation about instantaneous point of contact)
Note: If line of action passes through point of contact, it only spins.

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