Deck 3: Kinetic Concepts for Analyzing Human Motion

Question 1

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

Answer 1

its length

Question 2

Which of the following quantities is calculated the same as pressure?

A) stress
B) strain
C) shear
D) tension

Answer 2

stress

Question 3

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

Answer 3

repetitive loading

Question 4

Which of the following is a correct unit of inertia?

A) psi
B) kg/m³
C) lb/ft³
D) none of the above

Question 5

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

Question 6

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

Question 7

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

Question 8

When you wear a backpack, your center of gravity shifts in which direction?

A) up
B) back
C) forward
D) up and back

Question 9

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

Question 10

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

Question 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

Question 12

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 & B
D) neither A nor B

Question 13

Which of the following relationships is correct?

A) m = F/a
B) F = m/a
C) a = m/F
D) none of the above

Question 14

Which of the following is a correct unit of torque?

A) N-m
B) N/s
C) Ns
D) kg m

Question 15

Which of the following is a correct unit of pressure?

A) Newtons
B) kg/cm²
C) N/cm²
D) slugs

Question 16

Which of the following types of force act parallel to a surface?

A) shear
B) compression
C) tension
D) all of the above

Question 17

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

Question 18

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

Question 19

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

Question 20

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.

Question 21

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

Question 22

The rotary effect created by an eccentric force defines what?

A) torque
B) moment of force
C) rotary force
D) all of the above

Question 23

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

Question 24

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

Question 25

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

Question 26

The "quantity of matter composing a body" defines what?

A) weight
B) momentum
C) mass
D) inertia

Question 27

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

Question 28

Which of the following is/are scalar quantities?

A) force
B) mass
C) velocity
D) all of the above

Question 29

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

Question 30

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

Question 31

Inertia is directly proportional to which quantity(s)?

A) mass
B) force
C) acceleration
D) all of the above

Question 32

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

Question 33

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

Question 34

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

Question 35

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

Question 36

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

Question 37

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

Question 38

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

Question 39

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

Question 40

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

Question 41

The metric units for volume of solids and volume of liquids are the same.

Question 42

Describe the differences between weight and mass using examples and including units of measurement.

Question 43

Explain the difference between acute and repetitive loading, including examples and injury implications.

Question 44

Describe two different tools used to collect and analyze kinetic data and provide the strengths and weaknesses of each tool. Include both high tech and low tech examples.

Question 45

Draw a free-body diagram for a tennis player executing a forehand stroke under very windy conditions. Include all forces acting on the player.

Question 46

The opposite of tensile force (tension) is ___________________ force.

Question 47

The vector sum of all forces acting on a system or a free body is called __________________ force.

Question 48

The amount of three-dimensional space occupied by a body defines volume.

Question 49

During a ski jump landing, the anteriorly directed shear force elevates the stress on the anterior cruciate ligament.

Question 50

The amount of inertia possessed by a body is directly proportional to the ___________________ of the body.

Question 51

Both chronic and acute injuries can be very serious.

Question 52

Compare the compressive stress affecting the cervical vertebrae and the lumbar vertebrae.

Question 53

The metric units for mass and weight are the same.

Question 54

EMG is the abbreviation for ____________________.

Question 55

One __________________ is the amount of force required to accelerate 1 kg of mass at 1 m/s².