2014 F = ma Exam — Question 18 — Physics Guide

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FMA-2014-18 · 2014 F = ma (AAPT)

2014 F = ma Exam — Question 18

18. Consider the following diagram of a box and two weight scales. Scale A supports the box via a massless rope. A pulley is attached to the top of the box; a second massless rope passes over the pulley, one end is attached to the box and the other end to scale B. The two scales read indicate the tensions TA and TB in the ropes. Originally scale A reads 30 Newtons and scale B reads 20 Newtons. Box Frame Pulley Scale A Scale B TB TA If an additional force pulls down on scale B so that the reading increases to 30 Newtons, what will be the new reading on scale A? — Source: Question 18, 2014 F = ma Exam, © 2014 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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