First slide
Rolling motion
Question

A uniform solid disc is rolling on a horizontal surface. At a certain instant B is the point of contact and A is at height 2R from ground, where R is radius of disc:

Moderate
Solution

L=r×MVcm+Icmω

LB=mvR+12mR2ω                (v=)LB=32mvRLA=mvR+12mR2ω12mvR LB=3LA

As  LA=ve          i.e., in (ACW) direction        LB=+ ve         i.e., in (CW) direction 

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