In which of the following cases it is certainly not possible for the diac to perform pure rolling.

In which of the following cases it is certainly not possible for the d

1.	In which of the following cases it is certainly not possible for the diac to perform pure rolling.
Answer» A ROUGH inclined PLANE Asmooth inclined plane A smooth horizontal surface A rough horizontal surface Solution :In case of smooth inclined plane, speed of the disc will change DUE to component of weight along the surface but there is no force to apply torque about the CENTRE to change the angular speed accordingly. Hence it is not possible for the disc to PERFORM pure rolling on an inclined plane. Option (b) is correct. In all other cases condition of pure rolling can be achieved.