A uniform disc rolls without slipping with $v_{cm}$ as centre-of-mass speed. Find velocities of its highest point and instantaneous point of contact.
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Question

A uniform disc rolls without slipping with v c m v_{cm} v c m ​ as centre-of-mass speed. Find velocities of its highest point and instantaneous point of contact.

G1 Physics · Accepted Answer

Step 1: Pure rolling gives ωR=centre-of-mass speed. Step 2: Top point has speed centre-of-mass speed+ωR=2centre-of-mass speed; bottom contact has centre-of-mass speed-ωR=0. Final answer: A — 2centre-of-mass speed and zero.

A uniform disc rolls without slipping with v c m v_{cm} v c m ​ as centre-of-mass speed. Find velocities of its highest point and instantaneous point of contact.

A uniform disc rolls without slipping with v c m v_{cm} v c m as centre-of-mass speed. Find velocities of its highest point and instantaneous point of contact.