Apentix/AP Physics 1/Unit 3: Circular Motion and Gravitation/Question

AP Physics 1mediummcq1 pt

A ball rolls around the inside of a vertical loop-the-loop track. At the top of the loop, the normal force is zero. The ball's speed there depends on

A.the loop radius only (v = √(gr))

B.the ball's mass only

C.both mass and radius

D.the height of the ball

Explanation

Core Concept

With N = 0, gravity alone supplies mv²/r, so v = √(gr) — mass cancels.

Correct Answer

Athe loop radius only (v = √(gr))

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