AP Physics 1· difficulty 4/5
A solid disk and a hoop of equal mass and radius roll down identical inclines from rest. Which reaches the bottom first?
Depends on incline angle
Hoop
Same
Disk (smaller → less rotational KE → more translational KE → faster)
Explanation
Disk ; hoop . The disk converts more PE to translational KE (less to rotation), so it accelerates faster.
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