Deck 14: Angular Kinetics of Human Movement

Question 1

Which of the following is referred to as the "quantity of angular motion" possessed by a body?

A)angular displacement
B)angular velocity
C)angular acceleration
D)angular momentum

Answer 1

angular momentum

Question 2

The statement "a rotating body will maintain a state of constant angular motion unless acted on by an external torque" refers to which of the following?

A)Newton's first law of inertia
B)Newton's second law of acceleration
C)Newton's third law of action/reaction
D)None of these answers is correct

Answer 2

Newton's first law of inertia

Question 3

If a diver goes from a full layout position to a tuck position,what will happen to her angular velocity?

A)increase
B)decrease
C)remain the same
D)need more information

Answer 3

increase

Question 4

Centripetal force is related to which of the following?

A)radial acceleration
B)tangential acceleration
C)both radial acceleration and tangential acceleration
D)none of these answers is correct

Question 5

If a diver goes from a full layout position to a tuck position,what will happen to his momentum?

A)increase
B)decrease
C)remain the same
D)need more information

Question 6

Which of the following are accurate units for moment of inertia?

A)N•m
B)N•m²
C)kg•m²
D)kg•m

Question 7

What effect does "choking up" on a bat have?

A)reduces moment of inertia
B)increases angular velocity of swing
C)reduces mass
D)both reduces moment of inertia and increases angular velocity of swing
E)all of these answers are correct

Question 8

Which of the following is/are accurate formula(s)for angular momentum?

A)H = Iw
B)H = mk²w
C)M = mv
D)both H = Iw and H = mk²w
E)all of these answers are correct

Question 9

Which of the following quantities increases as moment of inertia decreases during the airborne phase of a dive?

A)angular momentum
B)angular velocity
C)both angular momentum and angular velocity
D)neither angular momentum nor angular velocity

Question 10

Which of the following is known as "center-seeking" force?

A)momentum
B)acceleration
C)centrifugal force
D)centripetal force

Question 11

In the absence of external torque,which of the following will increase when moment of inertia decreases?

A)angular momentum
B)angular velocity
C)both angular momentum and angular velocity
D)none of these answers is correct

Question 12

Which of the following accurately describes the radius of gyration of the forearm segment?

A)It is greater with respect to the wrist than with respect to the elbow.
B)It is greater with respect to the elbow than with respect to the wrist.
C)It is equal with respect to the wrist and with respect to the elbow.
D)Need more information.

Question 13

When a cyclist rounds a curve,where does centripetal force act?

A)on the cyclist's center of gravity
B)on the cycle's center of gravity
C)on the tires of the cycle
D)on the ground

Question 14

Torque is the angular analogue of what?

A)momentum
B)force
C)mass
D)impulse

Question 15

When knee flexion is increased,what happens to the moment of inertia of the leg about the hip?

A)increased
B)decreased
C)remains the same
D)need more information

Question 16

Centrifugal force is a misnomer. What is really happening when you feel a pull to the outside while rounding a curve?

A)centripetal force
B)inertia
C)both centripetal force and inertia
D)none of these answers is correct

Question 17

Rotating around which of the following principal axes of rotation has the least moment of inertia (anatomical position)?

A)transverse (frontal)
B)anteroposterior (sagittal)
C)longitudinal
D)need more information

Question 18

Regarding moment of inertia of the leg with respect to the hip,which of the following leg morphologies would favor a sprinter?

A)massive thighs and slimmer lower legs
B)massive lower legs and slimmer thighs
C)leg morphology does not matter
D)need more information

Question 19

Which of the following variables contribute to moment of inertia?

A)F and d
B)T and t
C)M and v
D)m and k

Question 20

Which of the following acts to produce a change in angular momentum?

A)moment of inertia
B)torque
C)angular impulse
D)none of these answers is correct

Question 21

Choose the term that describes the three mutually perpendicular axes passing through the total body center of gravity.

A)principal axes
B)principal moment of inertia
C)radius of gyration
D)moment of inertia

Question 22

Why are golf club heads weighted?

A)to increase the moment of inertia of the club with respect to the shoulder
B)to increase the moment of inertia of the club head rotating around the shaft
C)to decrease the moment of inertia of the club with respect to the shoulder
D)to decrease the moment of inertia of the club head rotating around the shaft

Question 23

Angular impulse is the product of ________ and ________.

Question 24

Choose the term that describes the distance from the axis of rotation to a point where the body's mass could be concentrated without altering its rotational characteristics.

A)angular impulse
B)principal axes
C)principal moment of inertia
D)radius of gyration

Question 25

Choose the term that describes the force directed toward the center of rotation.

A)angular momentum
B)center of mass
C)centripetal force
D)moment of inertia

Question 26

Which of Newton's laws (angular analogues)explains why a batter wears cleats?

A)1^st law - moment of inertia
B)2^nd law - angular acceleration
C)3^rd law - reaction
D)none of these answers is correct

Question 27

Which of the following is/are most important factor(s)affecting the magnitude of centripetal force?

A)tangential linear velocity
B)radius of rotation
C)mass
D)all of these answers are correct

Question 28

If total body angular momentum is 0,what will happen as the result of a forceful movement such as a spike?

A)compensatory rotation in lower body in opposite direction
B)compensatory rotation in upper body called follow-through
C)angular momentum is no longer 0
D)all of these answers are correct

Question 29

Choose the term that describes the following concept: for every torque,there is an equal and opposite torque.

A)Newton's 1^st law
B)Newton's 2^nd law
C)Newton's 3^rd law
D)principal axes

Question 30

Why is a bat easier to swing if you grip the barrel instead of the handle?

A)k is reduced
B)k is increased
C)moment of inertia is increased
D)easier to grip the barrel

Question 31

Choose the term that describes an inertial property for rotation bodies representing resistance to angular acceleration.

A)angular momentum
B)center of mass
C)principal moment of inertia
D)moment of inertia

Question 32

Choose the term that describes the quantity of angular motion.

A)angular momentum
B)center of mass
C)centripetal force
D)moment of inertia

Question 33

When a body is rotating,the force directed toward the center of rotation is called ________ force.

Question 34

According to Newton's 2^nd Law,what is the relationship among torque,moment of inertia,and angular acceleration?

A)T = Ia
B)I = Ta
C)a = TI
D)T = Iw

Question 35

Choose the term that describes the change in angular momentum equal to the product of torque and time interval over which the torque acts.

A)angular impulse
B)angular kinematics
C)angular kinetics
D)angular momentum

Question 36

Choose the term that describes the study of the action of forces on rotating bodies.

A)angular impulse
B)angular kinematics
C)angular kinetics
D)angular momentum

Question 37

How can a cyclist maintain balance when rounding a sharp curve?

A)slow down
B)lean to the inside of the curve
C)lean to the outside of the curve
D)both slow down and lean to the inside of the curve
E)none of these answers is correct

Question 38

Choose the term that describes the total-body moment of inertia relative to one of the principal axes.

A)principal axes
B)principal moment of inertia
C)moment of inertia
D)center of mass

Question 39

Choose the term that describes the following concept: a rotating body will maintain a state of constant rotational motion unless acted upon by an external torque.

A)Newton's 1^st law
B)Newton's 2^nd law
C)Newton's 3^rd law
D)principal axes

Question 40

What are the appropriate units for angular momentum?

A)kg•m²/s
B)kg•m/s²
C)kg²•m/s
D)kg•m²

Question 41

The principle moment of inertia of the human body is greatest around the anteroposterior axis.

Question 42

During skilled performance of a throw or strike,momentum is generally transferred from the more proximal segments to the more distal segments.

Question 43

What has historically been referred to as centrifugal force,is really just inertia.

Question 44

The angular analogue of Newton's second law can be stated algebraically as T = Iα.