2011 F = ma Exam — Question 16 — Physics Guide

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F = ma (11–17)

Dynamics

FMA-2011-16 · 2011 F = ma (AAPT)

2011 F = ma Exam — Question 16

Questions 16 and 17 refer to the information and diagram below. Jonathan using rope to lift a box with Becky in it; the box is hanging oﬀthe side of a bridge, Jonathan is on the top. A rope is hooked up from the box and passes a ﬁxed railing; Jonathan holds the box up by pressing the rope against the rail- ing with a massless, frictionless physics textbook. The static friction coeﬃcient between the rope and railing is µs; the kinetic friction coeﬃcient between the rope and railing is µk < µs; the mass of the box and Becky combined is M; and the initial height of the bottom of the box above the ground is h. Assume a massless rope. Becky Loose rope Floor Jonathan, pushes rope fixed hard railing on book against 16. What magnitude force does Jonathan need to exert on the physics book to keep the rope from slipping? — Source: Question 16, 2011 F = ma Exam, © 2011 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.

AP Physics 1 and AP Physics C (Mech) problems are adapted from OpenStax College Physics for AP® Courses 2e and University Physics Volume 1, © OpenStax (Rice University), licensed under CC BY 4.0. Problem text is reproduced exactly; correct answers come from the OpenStax answer keys. For written-answer problems, the incorrect answer choices were written by Physics Guide. Physics Guide is not affiliated with or endorsed by OpenStax or the College Board.