Download CHAPTER 3: KINETIC CONCEPTS FOR ANALYZING HUMAN MOTION

CHAPTER 3: KINETIC CONCEPTS FOR ANALYZING HUMAN MOTION
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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
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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. it is both the intersection of the 3 cardinal planes and the point around which a
body’s weight is equally balanced regardless of body position.
D. None of the choices is correct
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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
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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 choices are true
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5. Which of the following relationships is correct?
A. 1 kg = 2.2 lb
B. 1 lb = 4.45 N
C. both of the relationships are correct
D. neither of the relationships is correct
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6. Which of the following relationships is correct?
A. m = F / a
B. F = m / a
C. a = m / F
D. none of the relationships is correct
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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
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8. 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 of the statements are true
D. neither of the statements is true
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9. Which of the following is a correct unit of inertia?
A. psi
B. kg/m3
C. lb/ft3
D. none of the choices is the correct unit of inertia.
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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 choices are correct
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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. the are both equal in magnitude and opposite in direction
D. none of the choices are correct
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12. Which of the following types of force act parallel to a surface?
A. shear
B. compression
C. tension
D. all of the choices act parallel to a surface.
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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 choices are correct
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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 choices are correct
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15. Which of the following quantities is calculated the same as pressure?
A. stress
B. strain
C. shear
D. tension
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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 of the choices are true.
D. Neither of the choices is true.
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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 choices are correct
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18. Stress fractures result from which of the following types of loading?
A. acute loading
B. repetitive loading
C. both acute and repetitive loading
D. neither acute nor repetitive loading
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19. Which of the following is a correct unit of torque?
A. N-m
B. N/s
C. Ns
D. kg m
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20. When you wear a backpack, your center of gravity shifts in which direction?
A. up
B. back
C. forward
D. up and back
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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. they have the same volume and density
D. none of the choices are correct
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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 statements are true
D. none of the choices are true
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23. The rotary effect created by an eccentric force defines what?
A. torque
B. moment of force
C. rotary force
D. all of the choices are correct
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24. Which of the following is/are scalar quantities?
A. force
B. mass
C. velocity
D. all of the are scalar quantities.
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25. Scalar quantities and vector quantities have which of the following properties
in common?
A. magnitude
B. direction
C. both magnitude and direction
D. none of the choices are correct
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26. The “quantity of matter composing a body” defines what?
A. weight
B. momentum
C. mass
D. inertia
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27. Inertia is directly proportional to which quantity(s)?
A. mass
B. force
C. acceleration
D. all of the choices are correct
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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 choices are correct
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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 choices are included in a free body diagram.
D. neither of the choices are included in a free body diagram.
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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
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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
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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 reducing the force with which the ball is thrown and wearing a catcher’s
mitt
D. none of the choices are correct
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33. Which of the following is true regarding volume?
A. units are cm3
B. units are liters
C. units are both cm3 and liters
D. all of the choices are correct
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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 reducing the force with which the ball is thrown and wearing a catcher’s
mitt.
E. all of the choices are correct
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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 choies are correct
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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. because both bears more weight or force than other vertebrae and larger
weight-bearing surface area than other vertebrae.
D. none of the choices are correct
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37. A bending force can result in which of the following types of stress?
A. compression
B. tension
C. torsion
D. both compression and tension
E. all of the choices are correct
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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 choices are correct
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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. it both treats muscle injury with electrical impulses and measures the
electrical activity produced by a muscle.
D. none of the choices are correct