AP Physics 1 -- Circular Motion Test Review

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17 Terms

1
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<p>An object of mass m is on a horizontal rotating platform. The mass is located 0.22m from the axle and makes one revolution every 0.74s. The friction force needed to keep the mass from sliding is 13N.<strong> What is the object’s mass?</strong></p>

An object of mass m is on a horizontal rotating platform. The mass is located 0.22m from the axle and makes one revolution every 0.74s. The friction force needed to keep the mass from sliding is 13N. What is the object’s mass?

0.82kg

2
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A space shuttle orbits the earth at an altitude where the acceleration due to gravity is 8.70m/s2 What is the shuttle’s speed at this altitude?

7.68 × 103 m/s

3
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A ball at the end of a string is being swung in a horizontal circle. What is the direction of the acceleration of the ball?

Towards the center of the circle

4
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<p>A 1200kg car rounds a flat circular section of road<strong> </strong>with a radius of 85m at 20m/s as shown in the diagram. The coefficient of kinetic friction between the car tires and the road surface is 0.65. <strong>What minimum friction force is required for the car to follow this curve?</strong></p>

A 1200kg car rounds a flat circular section of road with a radius of 85m at 20m/s as shown in the diagram. The coefficient of kinetic friction between the car tires and the road surface is 0.65. What minimum friction force is required for the car to follow this curve?

5.6 × 103 N

5
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<p>A 1.2kg mass on the end of a string is rotated in a vertical circle of radius 0.85m. If the speed of the mass at the top of the circle is 3.6 m/s, <strong>what is the tension in the string at this location?</strong></p>

A 1.2kg mass on the end of a string is rotated in a vertical circle of radius 0.85m. If the speed of the mass at the top of the circle is 3.6 m/s, what is the tension in the string at this location?

6.5 N

6
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A 65kg pilot in a stunt plane performs a vertical loop with a 700m radius. The plane reaches a speed of 210 m/s at the bottom of the loop. What is the upward force on the pilot at the bottom of the loop?

4732 N

7
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<p>A 0.055kg puck is attached to a 0.150kg mass M by a cord that passes through a hole in a frictionless table, as shown. The puck travels in a circular path of radius 0.25m. <strong>What is the speed of the puck?</strong></p>

A 0.055kg puck is attached to a 0.150kg mass M by a cord that passes through a hole in a frictionless table, as shown. The puck travels in a circular path of radius 0.25m. What is the speed of the puck?

2.6 m/s

8
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<p>The diagram shows an object of mass 3.0kg traveling in a circular path of radius 1.2m while suspended by a piece of string of length 1.9m. <strong>What is the centripetal force on the mass?</strong></p>

The diagram shows an object of mass 3.0kg traveling in a circular path of radius 1.2m while suspended by a piece of string of length 1.9m. What is the centripetal force on the mass?

24 N

9
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<p>Two identical satellites have different circular orbits.<strong> Which has a higher speed?</strong></p>

Two identical satellites have different circular orbits. Which has a higher speed?

The one in the smaller orbit

10
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<p>An ice hockey puck is tied by a string to a stake in the ice. The puck is then swung in a circle. <strong>What force is producing the centripetal acceleration of the puck?</strong></p>

An ice hockey puck is tied by a string to a stake in the ice. The puck is then swung in a circle. What force is producing the centripetal acceleration of the puck?

Tension in the string

11
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<p>A 61kg skateboarder is moving down a ramp with a 7.0m radius of curvature. At the bottom of this ramp he reaches a speed of 7.8 m/s. <strong>What upward force acts on the skateboarder at the bottom of the ramp?</strong></p>

A 61kg skateboarder is moving down a ramp with a 7.0m radius of curvature. At the bottom of this ramp he reaches a speed of 7.8 m/s. What upward force acts on the skateboarder at the bottom of the ramp?

1.1 x 103 N

12
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Is it possible for an object moving with a constant speed to accelerate? Explain.

Yes, although the speed is constant, the direction of the velocity can be changing

13
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<p>A physics textbook swings back and forth as a pendulum. <strong>Which is the correct free-body diagram when the book is at the bottom and moving to the right?</strong></p>

A physics textbook swings back and forth as a pendulum. Which is the correct free-body diagram when the book is at the bottom and moving to the right?

C

14
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<p>The force of Planet Y on Planet X is <strong>____ </strong>the magnitude of F<sub>X on Y</sub></p>

The force of Planet Y on Planet X is ____ the magnitude of FX on Y

C. The same as

15
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Astronauts on the International Space Station are weightless because…

They are in freefall

16
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Hans, whose mass is 50kg, rides on a ferris wheel in a circular path at constant speed. When he is at the top of the wheel, the seat exerts an upward force of 420N on Hans. What is the centripetal force on Hans at the top of the wheel?

70N

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<p>An object is attached to a string that can withstand a maximum tension force of 6.3N. The object travels in a circular path of radius 0.40 m with a periods of 2.1s. <strong>What is the maximum mass of the object?</strong></p>

An object is attached to a string that can withstand a maximum tension force of 6.3N. The object travels in a circular path of radius 0.40 m with a periods of 2.1s. What is the maximum mass of the object?

1.8kg