AP Physics 1 Unit 4A: Linear Momentum and Impulse — practice questions — page 4

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Unit 4A: Linear Momentum and Impulse questions and exercises with answers

Showing questions 91–92 of 92.

A 70 kg tightrope walker makes a wire sag by 5 degrees. The tension in the wire is about:Read the answer and worked solution →Forces that appear only because an observer is in an accelerating frame of reference are:Read the answer and worked solution →

Worked practice questions

A 70 kg tightrope walker makes a wire sag by 5 degrees. The tension in the wire is about:

390 N
3900 N
686 N
70 N

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Correct answer: B. 3900 N

1. Only the small vertical component supports the weight. 2. Tension is weight over twice sin 5 degrees. 3. That gives about 3900 N, nearly six times the weight. _Source: OpenStax College Physics for AP Courses 2e, Chapter 4, Dynamics: Force and Newton's Laws of Motion (CC BY 4.0)._

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Forces that appear only because an observer is in an accelerating frame of reference are:

Contact forces
Restoring forces
Fictitious forces
Real world forces

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Correct answer: C. Fictitious forces

1. A merry-go-round rider feels one. 2. Such forces are fictitious. 3. Real forces have a physical origin. _Source: OpenStax College Physics for AP Courses 2e, Chapter 4, Dynamics: Force and Newton's Laws of Motion (CC BY 4.0)._

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