Test your Understanding: Quiz on Uniform Circular motion
5.1. Uniform Circular motion
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Test your Understanding on AP Physics C Course
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Question 1 of 15
1. Question
A car goes around a curve of radius r at a constant speed v. Then it goes around a curve of radius 2r at speed 2v. What is the centripetal force on the car as it goes around the second curve, compared to the first?
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Question 2 of 15
2. Question
The maximum speed around a level curve is 30.0 km/h. What is the maximum speed around a curve with twice the radius? (Assume all other factors remain unchanged.)
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Question 3 of 15
3. Question
A motorcycle has a mass of 250 kg. It goes around a 13.7 m radius turn at 96.5 km/h. What is the centripetal force on the motorcycle?
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Question 4 of 15
4. Question
A stone, of mass m, is attached to a strong string and whirled in a vertical circle of radius r. At the exact top of the path the tension in the string is 3 times the stone’s weight. The stone’s speed at this point is given by
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Question 5 of 15
5. Question
A car traveling 20 m/s rounds an 80m radius horizontal curve with the tires on the verge of slipping. How fast can this car round a second curve of radius 320 m? (Assume the same coefficient of friction between the car’s tires and each road surface.)
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Question 6 of 15
6. Question
A car is moving with a constant speed v around a level curve. The coefficient of friction between the tires and the road is 0.40. What is the minimum radius of the curve if the car is to stay on the road?
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Hint
Centripetal Force
Static Friction

Question 7 of 15
7. Question
A frictionless curve of radius 100 m, banked at an angle of 45°, may be safely negotiated at a speed of
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Hint
Centripetal Force
Vertical Forces

Question 8 of 15
8. Question
An object moves with a constant speed of 30 m/s on a circular track of radius 150 m. What is the acceleration of the object?
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Hint
Centripetal Acceleration

Question 9 of 15
9. Question
The second hand on a watch has a length of 4.50 mm and makes one revolution in 60.00 s. What is the speed of the end of the second hand as it moves in uniform circular motion?
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Question 10 of 15
10. Question
A race car is travelling at constant speed around a circular track. What happens to the centripetal acceleration of the car if the speed is doubled?
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Question 11 of 15
11. Question
A car travelling at 20 m/s rounds a curve so that its centripetal acceleration is 5 m/s^{2}. What is the radius of the curve?
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Question 12 of 15
12. Question
A boy is whirling a stone around his head by means of a string. The string makes one complete revolution every second, and the tension in the string is F_{T}. The boy then speeds up the stone, keeping the radius of the circle unchanged, so that the string makes two complete revolutions every second. What happens to the tension in the string?
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Question 13 of 15
13. Question
Which force is responsible for holding a car in a frictionless banked curve?
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Question 14 of 15
14. Question
Which force is responsible for holding a car in an unbanked curve?
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Question 15 of 15
15. Question
The earth exerts the necessary centripetal force on an orbiting satellite to keep it moving in a circle at constant speed. Which statement best explains why the speed of the satellite does not change even though there is a net force exerted on it?
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