Circular Motion and Gravitation Practice Test Provincial Questions
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1 Circular Motion and Gravitation Practice Test Provincial Questions 1. A kg car is traveling at 25 m s on a horizontal surface in a circular path of radius 85 m. What is the net force acting on this car? A. 0 N B N C N D N B 2. A 61 kg skateboarder is moving down a ramp with a 7.0 m 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? A N B N C N D N D
2 3. A stationary 25 kg object is released from a position m from the centre of the earth. What is the speed of the object just before impact? Ignore air resistance. A m s B m s C m s D m s A 4. A planet of radius m has a gravitational field strength of 68 N/kg at its surface. What is the period of a satellite orbiting this planet at a radius of m (twice the planet s radius)? A s B s C s D s C 5. An object travels with a constant speed in a circular path. The net force on the object is A. zero. B. towards the centre. C. away from the centre. D. tangent to the object s path. B
3 6. An object attached to a rotating table is moving in a circular path with a constant speed. Which is the correct free body diagram for the object? B 7. A 65 kg student is in a car traveling at 25 m s on a hill of radius 110 m. When the car is at the top of the hill, what upward force does the seat exert on the student? A. 270 N B. 370 N C. 640 N D. 910 N A
4 8. A kg car can travel without slipping at a maximum speed of 28 m s in a circular path of radius 70 m on a dry horizontal surface. When it rains, the coefficient of friction is reduced to one half its original value. What is the maximum speed under this wet condition? A. 7.0 m s B. 14 m s C. 20 m s D. 28 m s C 9. Which of the following graphs shows how the gravitational force varies with the distance of separation between two objects? D
5 10. A kg rocket is initially at rest on the surface of the earth. If J of work is done on this rocket, what maximum altitude h will the rocket reach? (Assume the rocket s mass does not change.) A m B m C m D m B 11. A car moving in a circular path with a constant speed has A. no acceleration. B. outward acceleration. C. tangential acceleration. D. centripetal acceleration. D
6 12. A person is moving at constant speed in a vertical circular path. Which is the correct free body diagram for the person while passing through the lowest point? D
7 13. A kg ball is attached to a kg mass M by a string that passes through a hole in a horizontal frictionless surface. The ball travels in a circular path of radius 0.35 m. What is the speed of the ball? A m s B. 1.9 m s C m s D. 4.1 m s C 14. A space station has an outer radius of 140 m. The station rotates so that the occupants at X at the outer wall experience an acceleration of 9.8 m s2. What acceleration will the occupants at Y experience at the 100 m radius? A. 7.0 m s2 B. 8.3 m s2 C. 9.8 m s2 D. 14 m s2 A
8 15. Which of the following graphs shows how the gravitational field of a body varies with distance from its centre? (Assume d is greater than the radius of the body.) A 16. A kg satellite with an orbital radius of m orbits the earth at an altitude of m. What is the orbital period? A s B s C s D s C 17. An object moves at a constant speed along a circular path as shown. Which vector represents the velocity of the object at this particular point on the path? A. 1 B. 2 C. 3 D. 4
9 B 18. What is the centripetal acceleration of a satellite having an orbital period of s while in a circular orbit of radius m? A. 0 m/ s 2 B. 5.2 m/ s 2 C. 7.6 m/ s 2 D. 9.8 m/s 2 C 19. Two satellites, X and Y, are placed in orbit around a planet. Satellite X has a period of revolution of s and an orbital radius of m. If the orbital radius of satellite Y is m, what is its orbital period? A s B s C s D s C 20. What is the escape velocity for an object on the surface of a kg planet of radius m? A. 7.0 m/s B m/s C m/s D m/s D
10 22. Long Answer 1. An astronaut stands on the surface of a planet of radius m. An object dropped from the astronaut s hand accelerates at 3.2 m/s2. a) What is the mass of this planet? M = 3.2 x kg b) What is the force of gravity on an 18 kg mass located on the surface of this planet? Fg = 58 N
11 2. A 3.5 kg object is suspended by a string and moves in a horizontal circle of radius 0.60 m. The tension in the string is 36 N. a) What is the magnitude of the net force on the object? b) What is the period of revolution of the object? Force = 11 N Period = 2.7 s 3. A 650 kg satellite in circular orbit around Earth has an orbital period of s. a) What is the satellite s orbital radius? R = 1.3 x 10 7 m b) What is the gravitational potential energy of this satellite? E p = -2.0 x J
12 4. A kg space probe is in a circular orbit around the Sun. The orbital radius is m. a) What is the orbital speed of this satellite? 1.37 x 10 5 m/s b) If the Sun collapsed to one-tenth its present radius without a change to its mass, the space probe s orbital radius will (Check one response.) stay the same. c) Using principles of physics, explain your answer to b).
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