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Transcript

Physics 160 - Chapter 5 Multiplechoice practise problems 1. The moment arm is defined as a. the distance from the point of application of a force to a specified axis of rotation b. the distance from the line of action of a force to a specified axis of rotation c. the perpendicular distance from the line of action of a force to a specified axis of rotation d. all of the above e. none of the above 2. Torque is defined as a. b. c. d. e. the tendency of a force to cause rotation the turning effect of a force the product of force and moment arm all of the above none of the above 3. The moment arm of the biceps brachii muscle about the elbow joint is largest when the angle at the elbow joint is approximately a. 180° (fully extended) b. 150° c. 120° d. 90° e. The angle of the elbow joint doesn't affect the moment arm of the biceps brachii muscle. 4. A weightlifter is attempting a biceps curl with a 200 N barbell. The moment arm of the barbell about the elbow joint is 40 cm. What torque is created by the barbell about the elbow joint? 5. What is the torque if a 50 N force is applied 2 m from the axis of rotation? a. b. c. d. e. 200 Nm 100 Nm 50 Nm 25 Nm 10 Nm 6. If the moment arm is 5 cm, and the force is 100 N, the magnitude of the torque will be a. b. c. d. e. 5 Nm 50 Nm 500 Nm 5000 Nm need more information to calculate 7. In the average female, the center of gravity is located a. b. c. d. e. higher than in the average male near the sternum in the same place as the average male near the acetabulum lower than in the average male 8. The center of gravity of an object of uniform density is located a. b. c. d. e. at the edge of the object slightly off center at the exact center of the object outside of the object off center, at the edge of the object 9. Stability may be increased by a. raising the center of mass b. decreasing the number of contact points in the base of support c. widening the base of support perpendicular to any oncoming force d. leaning away from an oncoming force e. none of the above 10. For a body to be in static equilibrium, a. b. c. d. e. all forces acting on the body must sum to zero all torques acting on the body must sum to zero the body must be stationary all of the above none of the above Physics 160 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. c. d. d. 80 Nm b. a. e. c. e. d. Answers