I keep getting “Rolling motion” questions wrong in Rotational Motion. What's the trap?
counting only translational KE and ignoring the rotational part.
The usual trap: counting only translational KE and ignoring the rotational part. How to avoid it: a rolling ball is always 'heavier' to accelerate than a sliding one. Go back to the definition — combined translation and rotation, so total KE = ½mv² + ½Iω².
Key point
Rolling motion
Common mistake
counting only translational KE and ignoring the rotational part.
Memory tip
a rolling ball is always 'heavier' to accelerate than a sliding one.
Tap to watch or see it right here — the app stays open (it only opens a quick search if nothing embeddable is found).