Chapter 3 study guide

Which of the following statements is/are true regarding vector algebra? A. In vector resolution, when a vector is resolved into two components, they are always perpendicular. B. In vector composition, only perpendicular components can be composed into a resultant. C. both A and B D. none of the above

A. In vector resolution, when a vector is resolved into two components, they are always perpendicular.

19. Which of the following is a correct unit of torque? A. N-m B. N/s C. Ns D. kg m

A. N-m

38. When injury results from a single large force application, such as a tackle, the injury is usually termed what? A. acute B. chronic C. repetitive D. all of the above

A. acute

1. When 2 force vectors are acting parallel and in the same direction, how do you compose them into one vector? A. add them B. subtract them C. divide them D. resolve them

A. add them

6. Which of the following relationships is correct? A. m = F/a B. F = m/a C. a = m/F D. none of the above

A. m = F/a

25. Scalar quantities and vector quantities have which of the following properties in common? A. magnitude B. direction C. both A and B D. none of the above

A. magnitude

27. Inertia is directly proportional to which quantities? A. mass B. force C. acceleration D. all of the above

A. mass

12. Which of the following types of force act parallel to a surface? A. shear B. compression C. tension D. all of the above

A. shear

15. Which of the following quantities is calculated the same as pressure? A. stress B. strain C. shear D. tension

A. stress

21. Which of the following is/are true regarding a shot put and a softball of equal diameter? A. they have the same volume B. they have the same density C. both A and B D. none of the above

A. they have the same volume

7. Which of the following statements is true? A. weight is always a force B. force is always a weight C. pressure is synonymous with force D. pressure is synonymous with weight

A. weight is always a force

16. Which of the following statements is/are true? A. Increasing the surface area over which a force is distributed increases the amount of stress acting on the surface. B. Decreasing the surface area over which a force is distributed increases the amount of stress acting on the surface. C. Both A and B are true. D. Neither A nor B is true.

B. Decreasing the surface area over which a force is distributed increases the amount of stress acting on the surface.

30. In a free body diagram of the human body, where would the vector representing weight of the body originate? A. contact between the feet and the ground B. center of gravity C. head D. need more information

B. center of gravity

3. Which of the following is not true about mass? A. quantity of matter B. changes depending on gravity C. measurement unit = kg D. affects force production E. all of the above are true

B. changes depending on gravity

14. Which of the following types of force exerts a squeezing effect on the body? A. shear B. compression C. tension D. all of the above

B. compression

31. In a free body diagram of the human body, which direction would the vector representing weight of the body point? A. up B. down C. depends on body orientation D. not possible to determine

B. down

10. Which of the following characteristics of a vector represents magnitude? A. its angle of orientation B. its length C. its direction D. all of the above

B. its length

36. Mechanical stress in the lumbar vertebrae is less than expected because of which of the following structural details? A. bears more weight or force than other vertebrae B. larger weight-bearing surface area than other vertebrae C. both A and B D. none of the above

B. larger weight-bearing surface area than other vertebrae

24. Which of the following is/are scalar quantities? A. force B. mass C. velocity D. all of the above

B. mass

18. Stress fractures result from which of the following types of loading? A. acute loading B. repetitive loading C. both A and B D. neither A nor B

B. repetitive loading

17. Which of the following occurs when a bone is caused to twist about the longitudinal axis? A. compression B. tension C. torsion D. none of the above

B. tension

8. Which of the following is a correct unit of pressure? A. Newtons B. kg/cm2 C. N/cm2 D. slugs

C. N/cm2

11. If two vectors lying in the same plane are added together and the result is zero, then which of the following is true of the vector quantities? A. they are equal in magnitude B. they are opposite in direction C. both A and B D. none of the above

C. both A and B

2. Which of the following defines center of gravity? A. intersection of the 3 cardinal planes B. the point around which a body's weight is equally balanced regardless of body position C. both A and B D. neither A nor B

C. both A and B

22. Which of the following statements is/are true regarding density? A. muscle tissue is more dense than fat tissue B. specific weight is proportional to density C. both A and B D. none of the above

C. both A and B

29. A free body diagram includes which of the following? A. sketch of an object, body, or body part being analyzed B. vectors representations of all forces acting on the system C. both A and B D. none of the above

C. both A and B

32. Which of the following will reduce the pressure of a baseball against a catcher's hand? A. reduce the force with which the ball is thrown B. wear a catcher's mitt C. both A and B D. none of the above

C. both A and B

5. Which of the following relationships is correct? A. 1 kg = 2.2 lb B. 1 lb = 4.45 N C. both A and B are correct D. neither A nor B is correct

C. both A and B are correct

26. The "quantity of matter composing a body" defines what? A. weight B. momentum C. mass D. inertia

C. mass

28. When muscles on opposite sides of a joint develop tension, what determines the direction of joint movement? A. muscle strength B. muscle flexibility C. net torque D. none of the above

C. net torque

13. Which of the following types of force exerts a pull on the body as in muscle contraction? A. shear B. compression C. tension D. all of the above

C. tension

23. The rotary effect created by an eccentric force defines what? A. torque B. moment of force C. rotary force D. all of the above

D. all of the above

35. The formula for torque includes force and what other variable? A. perpendicular distance from the axis of rotation B. moment arm C. force arm D. all of the above are correct

D. all of the above are correct

33. Which of the following is true regarding volume? A. units are cm3 B. units are liters C. directly proportional to mass D. both A and B E. all of the above

D. both A and B

37. A bending force can result in which of the following types of stress? A. compression B. tension C. torsion D. both A and B E. all of the above

D. both A and B

39. Which of the following is true regarding electromyography? A. treats muscle injury with electrical impulses B. measures the electrical activity produced by a muscle C. both A and B D. none of the above

D. none of the above

9. Which of the following is a correct unit of inertia? A. psi B. kg/m3 C. lb/ft3 D. none of the above

D. none of the above

20. When you wear a backpack, your center of gravity shifts in which direction? A. up B. back C. forward D. up and back

D. up and back

34. When absorbing the force of a baseball, which of the following will change the impulse? A. reduce the force with which the ball is thrown B. wear a catcher's mitt C. "give" with the ball when catching D. both A and B E. all of the above

E. all of the above

4. Which of the following is not true about weight? A. measurement unit = lb B. measurement unit = N C. weight is a force D. changes depending on gravity E. all of the above are true

E. all of the above are true