2025 F = ma Exam — Question 5 — Physics Guide

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F = ma (First 10)

Dynamics

FMA-2025-05 · 2025 F = ma (AAPT)

2025 F = ma Exam — Question 5

Three identical cylinders are used in this setup. Two of them are placed side by side on a horizontal surface, with a negligible distance between their surfaces so they do not touch. The third identical cylinder is placed on top of the first two, such that their centers form an equilateral triangle, as shown in the figure below. The coefficients of friction are: • µ1 : the coefficient of friction between the cylinders, and • µ2 : the coefficient of friction between the cylinders and the ground. For which of the following1 pairs (µ1 , µ2 ) will the system remain in equilibrium? 1 1 Pair 1: 21 , 12 . Pair 2: 3 , 10 . Pair 3: 14 , 18 . µ1 µ1 µ2 µ2 — Source: Question 5, 2025 F = ma Exam, © 2025 American Association of Physics Teachers (AAPT) and the U.S. Physics Team. Adapted by PhysicsTrainer: reformatted into a separate question and answer choices for online multiple-choice practice; any shared setup from nearby questions is repeated here. Not affiliated with or endorsed by AAPT or the U.S. Physics Team.

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F = ma problems are © the American Association of Physics Teachers (AAPT) and the U.S. Physics Team, the original source, and are used with permission. Problems shown here are adaptations: they have been reformatted by Physics Guide into separate question and answer-choice pieces for online multiple-choice practice. Physics Guide is an independent student project and is not affiliated with, endorsed by, operated by, or supported by AAPT, F = ma, USAPhO, or the U.S. Physics Team.

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