AP Physics 1· difficulty 3/5
A solid sphere, a solid disk, and a thin hoop — same mass and radius — are released simultaneously from rest at the top of a ramp and roll down without slipping. Which reaches the bottom <strong>first</strong>?
The thin hoop
The solid sphere
They all tie.
The solid disk
Explanation
The smaller the factor in , the greater the fraction of PE that becomes translational KE. . The sphere wins.
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