AP®PhysicsCollege BoardPhysics 1: Algebra-BasedExam QuestionsUnit 3: Work, Energy & PowerPower

Power (College Board AP® Physics 1: Algebra-Based)

Exam Questions

5 mins5 questions
1
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A carpenter pushes a box across a smooth wooden floor with her foot. She applies a force F parallel to the displacement of the box, causing it to move at a constant speed v. The coefficient of kinetic friction between the box and the wooden floor is mu.

Which of the following expressions describes the rate at which the carpenter does work on the box?

  • m g v

  • fraction numerator m g v over denominator v end fraction

  • mu m g v

  • fraction numerator mu m g over denominator v end fraction

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21 mark

A Jack-in-a-box is composed of a toy mounted on a compressed spring that is released when the box is opened. The spring has a spring constant of 16 space straight N divided by straight m and is compressed 5.3 space cm inside the box. The toy takes 0.8 space straight s spring out of the box.

Which of the following is most nearly the power delivered to the toy by the spring?

  • 0.56 space straight W

  • 0.65 space straight W

  • 5.6 space straight W

  • 6.5 space straight W

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31 mark

A constant force of 350 space straight N is needed to move a sofa over a carpeted floor at a constant rate. The force is applied at an angle of 55 degree from the vertical.

If the sofa is moving at a speed of 0.75 space straight m divided by straight s, which of the following is most nearly the power delivered to the sofa?

  • 150 space straight W

  • 215 space straight W

  • 285 space straight W

  • 350 space straight W

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41 mark

A warehouse worker pulls a crate of mass 18 space kg along the floor with a coefficient of kinetic friction of 0.3 using a rope applied at angle 24 degree from the horizontal. As the worker pulls the crate, the tension in the rope is 73 space straight N and they move the crate a distance of 13 space straight m in 90 space straight s.

Which of the following is most nearly the average power delivered to the crate by the worker?

  • 1.2 space straight W

  • 1.4 space straight W

  • 1.6 space straight W

  • 1.8 space straight W

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5
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The power output of an elevator motor is 85 space kW. The elevator travels at a constant maximum speed of 7.5 space straight m divided by straight s.

Which of the following is the maximum mass it can lift at this speed?

  • 1100 space kg

  • 1300 space kg

  • 1500 space kg

  • 1700 space kg

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