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AP®PhysicsCollege BoardPhysics 1: Algebra-BasedExam QuestionsUnit 2: Force & Translational DynamicsKinetic & Static Friction

Kinetic & Static Friction (College Board AP® Physics 1: Algebra-Based): Exam Questions

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1
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A box of mass 40 space kg is at rest on a wooden floor. The coefficient of friction between the box and the wooden floor is 0.3. A force of 22 space straight N is applied to the box so it is just at the point of moving.

Which of the following is the maximum magnitude of the static frictional force between the box and the floor?

  • 6.6 space straight N

  • 22 space straight N

  • 120 space straight N

  • 400 space straight N

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2
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Which of the following statements correctly describes the difference between static and kinetic friction?

  • Static friction acts when two surfaces are moving relative to each other, while kinetic friction prevents motion.

  • Kinetic friction always has a higher coefficient than static friction for the same surfaces.

  • Static friction prevents motion and acts until the applied force exceeds its maximum value, after which kinetic friction takes over.

  • Both static and kinetic friction have equal magnitudes for any two surfaces.

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3
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A 12.0 space kg block is stationary on a horizontal surface with mu subscript s space equals space 0.5.
Which of the following gives the maximum static friction force?

  • 0.042 space straight N

  • 6.0 space straight N

  • 60.0 space straight N

  • 240.0 space straight N

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4
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Which of the following is true about the coefficient of friction?

  • It has no units and depends on the surface materials.

  • It increases with the normal force.

  • It equals the ratio of applied force to the object’s mass.

  • It is always the same for static and kinetic friction.

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5
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Two boxes of unequal weight are pushed on a rough surface.
Which of the following is true about their frictional forces?

  • The heavier box experiences more friction.

  • Both experience the same friction.

  • Friction is independent of weight.

  • Friction is zero for the lighter box.

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1
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A car is driving along on a flat horizontal road at 35 space straight m divided by straight s when the driver quickly slams on the brakes and comes to a stop. The coefficient of kinetic friction between the tires and the road is 0.810.

Which of the following values is the distance the car travels before coming to a complete stop?

  • space 2 space straight m

  • 8 space straight m

  • space 76 space straight m

  • 153 space straight m

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2
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An object of mass 7.5 space kg is being pulled at a constant speed up an inclined plane at an angle of 35 degree to the horizontal by a force of 55 space straight Nacting parallel to the plane.

Which of the following is the coefficient of kinetic friction between the plane and the object?

  • 0.7

  • 0.8

  • 0.9

  • 1.6

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3
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An object of mass m is at rest on an inclined plane. The coefficient of static friction between the object and the surface of the plane is 0.71.

Which of the following is the largest angle of incline of the plane before the object starts to slip?

  • There is not enough information provided to determine the angle of the slope

  • 0.62 degree

  • 35.4 degree

  • 54.6 degree

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4
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Children of different masses are taking it in turns to sit in a sledge and slide down a steep incline of 60 degree to the horizontal. The maximum static frictional force applied to the sledge and the children before it begins to move is 450 space straight N. The mass of the sledge is negligible.

Which of the following is a best estimate for the minimum mass of a child that can sit in the sledge and slide down the incline without needing an applied force to get them in motion?

  • 45 space kg

  • 52 space kg

  • 90 space kg

  • 520 space kg

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5
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A horizontal force F is applied to a 7.5 space kg box which remains at rest on a rough horizontal surface with mu subscript s space equals space 0.4.

Which of the following most nearly gives the maximum force that can be applied without moving the box?

  • 20.0 space straight N

  • 30.0 space straight N

  • 40.0 space straight N

  • 45.0 space straight N

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1
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A 6.0 space kg block slides down a 5.0 space straight m incline at an angle of 35 degree to the horizontal. The coefficient of kinetic friction is mu subscript k space equals space 0.25. The block starts to move from rest at the top of the incline.

Which of the following most nearly gives the speed of the block at the bottom at the incline?

  • 4.5 space straight m divided by straight s

  • 5.0 space straight m divided by straight s

  • 5.5 space straight m divided by straight s

  • 6.0 space straight m divided by straight s

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2
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A solid disk of mass 4.0 space kg and radius 0.6 space straight m rolls without slipping down a 3.0 space straight m incline angled at 25 degree. The coefficient of static friction is mu subscript s space equals space 0.3.

The acceleration of a solid disk is given by the equation a space equals space 2 over 3 g sin theta

Which of the following gives the frictional force acting on the disk?

  • 4.0 space straight N

  • 4.9 space straight N

  • 5.6 space straight N

  • 6.5 space straight N

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3
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A 5.0 space kg block is placed on a rough inclined plane with an angle theta space equals space 30 degree. The coefficients of static and kinetic friction are mu subscript s space equals space 0.4 and mu subscript k space equals space 0.3 respectively.

Which of the following most nearly gives the ratio of the acceleration of this block to a block with triple the mass as it slides down the incline?

  • 1 colon 1

  • 1 colon 3

  • 1 colon 6

  • 1 colon 9

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4
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A 3.0 space kg block slides on a horizontal surface with an initial velocity of 15.0 space straight m divided by straight s. The coefficient of friction is mu subscript k space equals space 0.25.

Which of the following gives the distance the block travels before coming to rest?

  • 36.0 space straight m

  • 45.0 space straight m

  • 50.0 space straight m

  • 60.0 space straight m

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5
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A 15.0 space kg box is pushed horizontally with a force F space equals space 50.0 space straight N on a rough horizontal surface. It does not move due to the static friction it experiences where mu subscript s space equals space 0.5. If the box were to move then mu subscript k space equals space 0.3.

Which of the following most nearly gives the fraction fraction numerator open vertical bar F with rightwards arrow on top subscript s close vertical bar over denominator open vertical bar F with rightwards arrow on top subscript k close vertical bar end fraction the box were to experience if it does move?

  • 0.6

  • 1.1

  • 1.25

  • 1.5

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