AP®PhysicsCollege BoardPhysics 1: Algebra-BasedExam QuestionsUnit 2: Force & Translational DynamicsForces & Free-Body Diagrams

Forces & Free-Body Diagrams (College Board AP® Physics 1: Algebra-Based)

Exam Questions

5 mins5 questions
1
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When a person steps onto an electronic scale on the floor of a stationary elevator it gives a reading of 60 space kg.

Which of the following is most nearly the reading on the scale when the elevator accelerates upwards at 3 space straight m divided by straight s squared?

  • 42 space kg

  • 60 space kg

  • 78 space kg

  • 780 space straight N

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2
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An object of mass 5 space kg is placed at the top of a frictionless inclined plane of length 15 space straight m and vertical height 10 space straight m.

Which of the following is most nearly the magnitude of the net force on the object as it slides down the inclined plane?

  • 8.7 cross times 10 to the power of negative 3 end exponent space straight N

  • 1.3 space straight N

  • 33 space straight N

  • 42 space straight N

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3
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Which of the following statements correctly describes the motion of an object when a net force of zero is exerted on it?

  • The object is stationary.

  • The object's direction will change but not its speed.

  • The object's speed will change but not its direction.

  • The object's velocity will remain constant.

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4
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An object is released from rest at the top of a frictionless inclined plane at a height of 0.8 space straight m. The angle of incline is 15 space degree.

Which of the following is most nearly the speed of the object at the bottom of the incline?

  • 4.0 space straight m divided by straight s

  • 7.0 space straight m divided by straight s

  • 16 space straight m divided by straight s

  • 260 space straight m divided by straight s

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5
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Which of the following statements correctly describes the normal force?

  • The normal force arises from the repulsion of electrons in atoms.

  • The normal force is always parallel to the surface.

  • The normal force is directed towards the surface.

  • The normal force is a non contact force.

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