Welcome to Unit 7 AP Physics 1 Multiple Choice Questions
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Facts about the test: The AP Physics 1 exam has 50 multiple-choice questions (45 single-select and 5 multiple-select) and you will be given 90 minutes to complete the section. That means it should take you around 15 minutes to complete 8 questions.
The following questions were not written by College Board and, although they cover information outlined in the AP Physics 1 Course and Exam Description, the formatting on the exam may be different.
1. The diagram shows two wheels of radius r and 3r connected to each other and mounted on frictionless bearings. A mass m1 hangs from a string wrapped around the smaller wheel while a mass m2 hangs from a string wrapped around the larger wheel. If the system remains at rest even after being released, which of the following must be true?
2. Suppose both masses are equal. If the system is released from rest, which mass will accelerate upward, and which mass will have a greater magnitude of acceleration?
A. m2 accelerates upward and m1 has a greater acceleration
B. m2 accelerates upward and m2 has a greater acceleration
C. m1 accelerates upward and m1 has a greater acceleration
D. m1 accelerates upward and m2 has a greater acceleration
3. A shopping cart shown from above has three wheels that roll on frictionless bearings, but one of the wheels A or B has significant friction. When a force F is applied to the handle as shown, the center of mass of the cart speeds up and the cart turns to the left. Which wheel has friction, and is the friction greater or less in magnitude than F?
A. A has friction and the magnitude is more than F
B. A has friction and the magnitude is less than F
C. B has friction and the magnitude is more than F
D. B has friction and the magnitude is less than F
4. Three forces of equal magnitude are incident on a regular hexagon that is initially at rest and not rotating. How will the hexagon rotate and in what direction will the hexagon’s center of mass accelerate as a result of the action of these three forces?
A. Clockwise rotation, rightward acceleration
B. Clockwise rotation, down-right acceleration
C. counterclockwise rotation, rightward acceleration
D. counterclockwise rotation, down-right acceleration
5. A plank of total length L is set on the flat roof of a building so that the length of the plank that is over the edge of the building is x. A person who has the same mass as the plank will walk out onto the plank all the way to the end. What is the maximum value that x can have if the plank is not to tip at any time while the person walks out towards its end?
6. A child of mass M is sitting on a circular platform of mass 5M which is rotating counterclockwise without friction. Which of the following actions could the child do to increase the angular momentum of the child-platform system?
A. Move towards the center of the platform
B. Move towards the edge of the platform
C. Walk in a concentric circle, in a clockwise direction
D. None of these options will increase the angular momentum of the system
7. An ice skater is spinning in place with an angular velocity w. As they extend their hands outwards...
A. Their moment of inertia increases and their angular momentum increases
B. Their moment of inertia increases and their angular momentum remains constant
C. Their moment of inertia increases and their angular momentum decreases
D. Their moment of inertia decreases and their angular momentum decreases
8. A horizontal, uniform board of weight 125 N and length 4 m is supported by vertical chains at each end. A person weighing 500 N is sitting on the board. The tension in the right chain is 250 N. How far from the left end of the board is the person sitting?
9. A horizontal, uniform board of weight 125 N and length 4 m is supported by vertical chains at each end. A person weighing 500 N is sitting on the board. The tension in the right chain is 250N. What is the tension in the left chain?
A. The weight of the left-hand side is greater than the weight of the right-hand side
B. The weight of the left-hand side is less than the weight of the right-hand side
C. The weight of the left-hand side is equal to the weight of the right-hand side
D. None of the other statements are true
A. F decreases but is non-zero
B. F increases
C. F remains the same
D. F decreases to zero
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