AP Physics 1 – AlgebraBased: Unit 7 Torque and Rotational Motion Practice Test
AP Physics 1 – AlgebraBased: Unit 7 Torque and Rotational Motion Practice Test
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Question 1 of 19
1. Question
A door is at rest when a ball collides with the edge of it. The ball bounces off and causes the door to rotate counterclockwise about its frictionless axle at the other end. How does the collision change the magnitude of the total angular momentum of the balldoor system? (Answer using a coordinate system where counterclockwise is positive.)
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Question 2 of 19
2. Question
A collapsing star of mass m rotates with speed v_{ 0} for a point on its surface at a distance 2 r from the axis of rotation. The star collapses to radius r but the mass remains the same. What is the final speed v of a point at the collapsed star’s surface (radius r from the axis of rotation) and how does it compare to its initial speed?
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Question 3 of 19
3. Question
A point on the edge of a satellite with mass m moves with speed v_{ 0} at a distance of r from the central axis of rotation. The satellite unfolds its panels, increasing its radius to 2 r but the mass remains the same. What is the final speed v of a point at the edge of the satellite’s panels and how does it compare to its initial speed?
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Question 4 of 19
4. Question
A disc of diameter sits at rest on a frictionless table. A ball of mass strikes the edge of the disc with a speed and continues with a speed , causing the disc to rotate counterclockwise around a fixed axis at the middle. The rotational inertia of the disc is . What is the angular velocity of the disc after the collision? (Answer using a coordinate system where counterclockwise is positive.)
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Question 5 of 19
5. Question
Two disks with the same mass and radius are released from rest at the top of two identical ramps. One disk rolls without slipping, and one slides down the ramp with no friction. Which object reaches the ground first?
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Question 6 of 19
6. Question
A ball and a block of ice with the same mass are released from rest at the top of two identical ramps. The ball rolls without slipping, and the ice block slides down the ramp with no friction. Which object reaches the ground last?
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Question 7 of 19
7. Question
Which has greater angular speed, a horse near the outside rail of a merrygo round or a horse near the inside rail?
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Question 8 of 19
8. Question
A marrygoround starts from rest,a reaches an angular speed of in 3 seconds . What is its angular acceleration, and through what angle does it sweep in the 3−second time interval?
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Question 9 of 19
9. Question
A 2.0 N force F is applied to a bar that can pivot around its end as shown above. The force is parallel to the bar and is r=0.50 m away from the end. What is the torque on the bar? (Answer using a coordinate system where counterclockwise is positive.)
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Question 10 of 19
10. Question
A 25 N force F is applied to a bar that can pivot around its end as shown above. The force is r=0.75 m away from the end and at an angle Θ=60 ° . What is the torque on the bar? (Answer using a coordinate system where counterclockwise is positive.)
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Question 11 of 19
11. Question
A 2.00 kg solid, uniform ball of radius 0.100 m is released from rest at point A as shown in the figure, its center of gravity a distance of 1.50 m above the ground. The ball rolls without slipping to the bottom of an incline and back up to point B where it is launched vertically into the air. The ball rises to its maximum height h max at point C. At point B, find the ball’s translational speed. (The ball’s )
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Question 12 of 19
12. Question
A disk of mass is spinning freely at when a second identical disk, initially not spinning, is dropped onto it so that their axes coincide. In a short time the two disks are corotating. If a third such disk is dropped on the first two, find the final angular speed of the system.
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Question 13 of 19
13. Question
A large grinding wheel in the shape of a solid cylinder ( ) of radius is free to rotate on a frictionless, vertical axle. A constant tangential force of applied to its edge causes the wheel to have an angular acceleration of . What is the moment of inertia of the wheel?
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Question 14 of 19
14. Question
A potter’s wheel having a radius of and a moment of inertia of is rotating freely at . The potter can stop the wheel in by pressing a wet rag against the rim and exerting a radially inward force of . Find the acceleration of the wheel.
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Question 15 of 19
15. Question
Which is NOT true about torque?
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Question 16 of 19
16. Question
What is the magnitude and direction of the NET torque at the point O?
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Question 17 of 19
17. Question
A person sits on a freely spinning lab stool that has no friction in its axle. When this person extends her arms…
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Question 18 of 19
18. Question
An ice skater spins with his arms far from his body with an angular speed ω i . While spinning, the ice skater then brings his arms inward. What happens to the ice skater’s angular speed when he brings his arms inward?
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Question 19 of 19
19. Question
Torque is the cross product of the force and the moment arm. Cross product means…
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