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

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Forces & Free-Body Diagrams

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1
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1 mark

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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2
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1 mark

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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3
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1 mark

Which of the following correctly describes forces as interactions?

  • Forces are properties of a single object.

  • Forces always result from interactions between two objects.

  • Forces are independent of the environment.

  • Forces only exist if an object is in motion.

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4
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1 mark

Which of the following gives an example of a contact force?

  • Gravitational force.

  • Tension in a cable.

  • Magnetic force.

  • Electrostatic force.

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5
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1 mark

Which of the following correctly describes translational equilibrium?

  • The net force acting on the object is zero.

  • The object must remain stationary.

  • Friction always balances the applied force.

  • The object has no forces acting on it.

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1
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1 mark

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

Which of the following is most nearly the reading on the scale when the elevator accelerates upwards at 3 m/s2?

  • 42 kg

  • 60 kg

  • 78 kg

  • 780 N

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2
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1 mark

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

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

  • 8.7×10−3 N

  • 1.3 N

  • 33 N

  • 42 N

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3
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1 mark

A block of mass 5.0 kg rests on an inclined plane making an angle of 30° with the horizontal. The coefficient of static friction between the block and the plane is μs = 0.4.

Which of the following is the maximum angle at which the block will remain stationary?

  • 10°

  • 20°

  • 22°

  • 30°

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4
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1 mark

A 10.0 kg box is suspended by two ropes at angles of 45° and 60° to the horizontal.

Which of the following best describes the tension in the rope at 60°?

  • 60 N

  • 73 N

  • 81 N

  • 100 N

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5
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1 mark

A 20.0 kg box is pushed across a horizontal surface with a horizontal force of 50.0 N. The coefficient of kinetic friction between the box and the surface is μk = 0.2.

Which of the following is the acceleration of the box along the horizontal surface?

  • 0.50 m/s2

  • 0.70 m/s2

  • 1.0 m/s2

  • 1.2 m/s2

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1
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1 mark

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

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

  • 4.0 m/s

  • 7.0 m/s

  • 16 m/s

  • 260 m/s

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2
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1 mark

An object of mass 5.0 kg slides down a rough inclined plane starting from rest. The incline of length 10.0 m makes an angle of 30° with the horizontal and the coefficient of static friction between the object and the incline is μk = 0.2.

Which of the following correctly describes the magnitude of the acceleration down the incline?

  • 0.8 m/s2

  • 1.6 m/s2

  • 3.3 m/s2

  • 24.5 m/s2

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3
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1 mark

A uniform beam of length 6.0 m and weight 500.0 N is supported at one end by a hinge and at the other by a rope attached 1.0 m from the beam's free end. A 300.0 N load is placed 2.0 m from the hinge.

Which of the following best describes the tension in the rope?

  • 300 N

  • 400 N

  • 450 N

  • 500 N

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4
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1 mark

A 10.0 kg box is pulled across a rough horizontal surface by two ropes. The first rope applies a force of 30.0 N at an angle of 40° above the horizontal, and the second rope applies at force of 20.0 N at an angle of 20° below the horizontal. The coefficient of kinetic friction between the box and the surface is μk = 0.25.

Which of the following is most nearly the acceleration of the box?

  • 0.8 m/s2

  • 1.2 m/s2

  • 1.5 m/s2

  • 2.0 m/s2

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5
1 mark

A 4.0 kg object is suspended by two ropes. One rope is horizontal, and the other rope makes an angle of 50.0° with the vertical.

Which of the following is most nearly the magnitude of the tension in the horizontal rope?

  • 50.0 N

  • 55.0 N

  • 61.0 N

  • 65.0 N

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