Circular Motion Class: Name: Date: 1. What is the magnitude of the centripetal acceleration of a 4-kilogram mass orbiting at 10 meters per second with a radius of 2 meters? (1) 5 m/sec 2 (2) 50 m/sec 2 (3) 80 m/sec 2 (4) 200 m/sec 2 4. As the radius of an orbiting satellite is decreased, the speed required to keep it in orbit will have to (1) decrease (2) increase (3) remain the same 2. In the diagram shown, satellite S moves in a circular orbit around the Earth (E). The direction of the acceleration of the satellite is toward point 5. An object traveling with uniform circular motion has a centripetal acceleration due to the change in (1) speed (2) direction (3) kinetic energy (4) mass (1) A (2) B (3) C (4) D 6. The diagram here represents a mass of 1.0 kilogram traveling at 8.0 meters per second in a circular path of radius 4.0 meters. 3. A student using a stopwatch finds that the time for 10 complete orbits of a ball on the end of a string is 25 seconds. The period of the orbiting ball is (1) 25 sec (2) 2.0 sec (3) 2.5 sec (4) 5.0 sec What is the centripetal acceleration of the object? (1) 10 m/sec 2 (2) 2.0 m/sec 2 (3) 16 m/sec 2 (4) 4.0 m/sec 2 page 1
7. If the mass of the object is doubled, the magnitude of the centripetal force will be (1) one-half as much (2) twice as much (3) one-fourth as much (4) four times as much 9. If the velocity of a car traveling around a circular track doubles, its centripetal acceleration would be (1) 1 2 as great (2) 2 times greater (3) 1 4 as great (4) 4 times greater 8. If object O is moving in a uniform circular motion around point P at constant speed, which vector shown represents a centripetal force? (1) 10. An object on the end of a string rotates clockwise in a circle as shown in the diagram. If the string breaks when the object is at point X, which arrow below best represents the path of the object after the string has broken? (2) (1) (2) (3) (3) (4) (4) Class: page 2 Circular Motion
11. A motorcycle of mass 100 kilograms travels around a flat, circular track of radius 10 meters with a constant speed of 20 meters per second. What force is required to keep the motorcycle moving in a circular path at this speed? (1) 200 N (2) 400 N (3) 2000 N (4) 4000 N 13. While the object is undergoing uniform circular motion, its acceleration (1) has a magnitude of zero (2) increase in magnitude (3) is directed toward the center of the circle (4) is directed away from the center of the circle 12. The diagram shows an object with a mass of 1.0 kilogram attached to a string 0.50 meter long. The object is moving at a constant speed of 5.0 meters per second in a horizontal circular path with center at point O. 14. If the string is cut when the object is at the position shown, the path the object will travel from this position will be (1) toward the center of the circle (2) a curve away from the circle (3) a straight line tangent to the circle What is the magnitude of the centripetal force acting on the object? (1) 2.5 N (2) 10 N (3) 25 N (4) 50 N 15. If the string is lengthened while the speed of the object remains constant, the centripetal acceleration of the object will (1) decrease (2) increase (3) remain the same Class: page 3 Circular Motion
16. The diagram shows a 2.0-kilogram model airplane attached to a wire. The airplane is flying clockwise in a horizontal circle of radius 20 meters at 30 meters per second. 18. A vehicle travels at a constant speed of 6.0 meters per second around a horizontal circular curve with a radius of 24 meters. The mass of the vehicle is 4.4 10 3 kilograms. An icy patch is located at P on the curve. The centripetal force acting on the airplane at the position shown is directed toward point (1) A (2) B (3) C (4) D What is the magnitude of the frictional force that keeps the vehicle on its circular path? (1) 1.1 10 3 N (2) 6.6 10 3 N (3) 4.3 10 4 N (4) 6.5 10 4 N 17. What is the magnitude of the centripetal acceleration of the airplane? (1) 0 m/s 2 (2) 1.5 m/s 2 (3) 45 m/s 2 (4) 90 m/s 2 19. On the icy patch of pavement, the frictional force on the vehicle is zero. Which arrow best represents the direction of the vehicle s velocity when it reaches icy patch P? (1) (2) (3) (4) Class: page 4 Circular Motion
20. A 60-kilogram adult and a 30-kilogram child are passengers on a rotor ride at an amusement park. When the rotating hollow cylinder reaches a certain constant speed, v, the floor moves downward. Both passengers stay pinned against the wall of the rotor, as shown in the diagram. 21. Compared to the magnitude of the acceleration of the adult, the magnitude of the acceleration of the child is (1) less (2) greater (3) the same The magnitude of the frictional force between the adult and the wall of the spinning rotor is F. What is the magnitude of the frictional force between the child and the wall of the spinning rotor? (1) F (2) 2F (3) F 2 (4) F 4 Class: page 5 Circular Motion
Problem-Attic format version 4.4.183 c 2011 2013 EducAide Software Licensed for use by B Fejzo Terms of Use at www.problem-attic.com Class: Circular Motion 06/25/2013 1. 2. Answer: 1 3. 4. 5. 6. 7. 8. 9. 10. Answer: 1 11. 12. 13. 14. 15. Answer: 1 16. 17. 18. 19. 20. 21.