QuestionTeacher only· AP Physics C: Mech.Solved

Rolling without slipping — energy method giving wrong answer

LMinseo Lee·144d ago

I'm using ½mv² + ½Iω² but my final answer is half the expected value. Suspect I'm double-counting the moment of inertia. Could you check my working in the attached image?

#rotation#energy

1 reply

Accepted answer

PMinjun ParkTeacher· 144d ago

Yes — for rolling without slipping you should substitute ω = v/r BEFORE adding the rotational KE term. You probably treated v and ω as independent, which double-counts.