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AP®PhysicsCollege BoardPhysics 1: Algebra-BasedExam QuestionsUnit 2: Force & Translational DynamicsNewton's Laws

Newton's Laws (College Board AP® Physics 1: Algebra-Based): Exam Questions

11 mins11 questions
1
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Which of the following statements about inertia is correct?

  • It is always more difficult to move a larger box.

  • Objects with a greater mass have a greater inertia.

  • Inertia is the tendency of an object to follow a change in motion.

  • Objects with a smaller mass have a greater tendency to resist a change in motion.

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2
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The Moon orbits the Earth at a constant speed of around 2000 mph. Which of the following statements are correct?

  • This is not an example of Newton's first law of motion.

  • The Moon moves with a constant velocity of 2000 mph.

  • The centripetal force on the Moon is created by the gravitational force from the Sun.

  • The net force acting on the Moon is zero.

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3
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An object is attached from above by a light inextensible string. The object is initially at rest before it is released and slides down a rough inclined plane. At the start of the motion, the string is slack. When the object reaches the bottom of the inclined plane the string is fully extended.

Which of the following correctly describes the motion in each plane?

  • Parallel to inclined plane

    Perpendicular to inclined plane

    balanced forces act down the slope to bring the object to a rest at the bottom

    unbalanced forces act perpendicular to the slope due to the tension in the light inextensible string

  • Parallel to inclined plane

    Perpendicular to inclined plane

    unbalanced forces act down the slope due to friction

    unbalanced forces act perpendicular to the slope to cause the string to lengthen

  • Parallel to inclined plane

    Perpendicular to inclined plane

    balanced forces act down the slope causing the object to move at a constant speed

    balanced forces act perpendicular to the slope to lengthen the light inextensible string

  • Parallel to inclined plane

    Perpendicular to inclined plane

    unbalanced forces act down the slope causing it to accelerate

    balanced forces act perpendicular to the slope so there is no motion away from or into the inclined plane of the slope

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4
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Which of the following statements about Newton's third law are correct?

  • A Newton's third law pair describes the interaction of two forces opposite in direction on one object.

  • A Newton's third law pair describes the interaction of two objects in terms of the paired forces that each exerts on the other.

  • A Newton's third law pair must be different types of force.

  • In a Newton's third law pair the forces have different magnitudes.

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51 mark

An object of mass m is placed at rest on a frictionless, horizontal shelf attached to a wall perpendicular to the surface of the Earth. An identical object is at rest on a frictionless, horizontal shelf attached to a wall perpendicular to the surface of Mars.

A net force F with rightwards arrow on top subscript n e t end subscript is needed to accelerate the object on Earth along the shelf with an acceleration a. The acceleration due to gravity at the surface of Earth, g subscript e a r t h end subscript is three times that of the acceleration due to gravity on Mars, g subscript m a r s end subscript.

Which expression correctly identifies the force needed to give the object on Mars the same acceleration as that on Earth?

  • F with rightwards arrow on top subscript n e t end subscript

  • 3 F with rightwards arrow on top subscript n e t end subscript

  • F with rightwards arrow on top subscript n e t end subscript over 3

  • 2 over 3 F with rightwards arrow on top subscript n e t end subscript

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6
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A box is placed on a flat, frictionless surface. A constant force of 20 space straight N is applied to the box horizontally. If the box has a mass of 4 space kg, what will happen to the box after the force is removed?

  • It will stop immediately.

  • It will continue moving at a constant speed.

  • It will slow down gradually.

  • It will accelerate.

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7
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A car travels along a straight road for 15 space km at a constant speed for 8 minutes.

What can be inferred about the net force acting on the car?

  • It is equal to the car's weight.

  • It is directed opposite to the car's motion.

  • It is equal to the applied force.

  • It is zero.

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8
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An object remains at rest on a table. Which of the following explains why it does not move?

  • The object exerts a force on the table, and the table exerts an equal but opposite force on the object.

  • The normal force of the table on the object and the gravitational force of the Earth on the object are balanced.

  • The frictional force of the table on the object and the normal force of the table on the object are balanced.

  • The table provides an upward acceleration that counteracts the acceleration due to gravity.

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9
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Two ice skaters push off from each other. If Skater A has half the mass of Skater B, how do their accelerations compare?

  • Skater A has half the acceleration of Skater B.

  • Skater A has the same acceleration as Skater B.

  • Skater A has twice the acceleration of Skater B.

  • Skater A has four times the acceleration of Skater B.

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10
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A 5 space kg object is dropped from rest. What is the reaction force to the Earth’s gravitational pull on the object?

  • The object pulling the Earth upward with a force of 50 space straight N.

  • The air resistance acting on the object with a force of 50 space straight N.

  • The object pulling the Earth upward with a force of 10 space straight N.

  • The air resistance acting on the object with a force of 10 space straight N.

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11
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Two bodies, X and Y, of masses m subscript X and m subscript Y respectively, exert forces on each other and have no external forces acting on them. The force acting on X is F with rightwards arrow on top, which gives X an acceleration a with rightwards arrow on top subscript X.

What is the magnitude of the force on Y and its acceleration?

 

Magnitude of force on Y

Acceleration of Y

A

m subscript Y over m subscript X open vertical bar F with rightwards arrow on top close vertical bar

a subscript X

B

open vertical bar F with rightwards arrow on top close vertical bar

m subscript Y over m subscript X a subscript X

C

m subscript X over m subscript Y open vertical bar F with rightwards arrow on top close vertical bar

a subscript X

D

open vertical bar F with rightwards arrow on top close vertical bar

m subscript X over m subscript Y a subscript X

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