2019 F = ma Exam B — Question 22 — Physics Guide

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FMA-2019B-22 · 2019B F = ma (AAPT)

2019 F = ma Exam B — Question 22

The bruise threshold for a fruit is the largest height it can be dropped from rest without bruising. The bruise threshold of a 0.2 kg apple on steel is 10 cm. Suppose that it always takes 0.1 seconds after impact for the apple to fully stop and that 4 cm2 of the apple comes into contact with the surface during the impact. What minimum average pressure is required to cause the apple to bruise? — Source: Question 22, 2019 F = ma Exam B, © 2019 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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