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

5 mins5 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 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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