Chapter 11: Angular Kinematics of Human Movement
1.
An angle formed by a body segment with respect to horizontal is what?
A.
relative angle
B.
absolute angle
C.
acute angle
D.
none of the above


2.
If all other factors are held constant, what effect would “choking up” on a bat have on the resultant linear velocity of a hit ball?
A.
increase
B.
decrease
C.
remain the same
D.
need more information


3.
If angular acceleration is constant, then angular velocity must be
A.
constant
B.
increasing or decreasing
C.
equal to zero
D.
none of the above


4.
The component of angular acceleration directed toward the center of curvature defines what?
A.
radial acceleration
B.
tangential acceleration
C.
angular acceleration
D.
linear acceleration


5.
What quantity will have the following units? rad/s
A.
linear displacement
B.
angular displacement
C.
linear velocity
D.
angular velocity


6.
If the angular velocity of a batter's shoulders increases, what will happen to the linear velocity of the end of the bat?
A.
increase
B.
decrease
C.
stay the same
D.
end of the bat has no linear velocity


7.
Which of the following terms describes the location of the center of rotation at a joint at a given instant in time?
A.
precise center
B.
exact center
C.
instant center
D.
none of the above


8.
Which of the following terms describes the angle formed between the longitudinal axes of two adjacent body segments?
A.
the static angle
B.
the relative angle
C.
the absolute angle
D.
none of the above


9.
Which angular direction is conventionally regarded as positive?
A.
clockwise
B.
counterclockwise
C.
flexion
D.
extension


10.
Which of the following is/are true regarding a radian?
A.
it is equal to 57.3 degrees
B.
it is the size of the angle subtended by an arc of radius length
C.
it is a unit of angular displacement
D.
all of the above are true


11.
Which of the following expressions defines angular velocity?
A.
change in angular position over a given time
B.
angular displacement divided by time
C.
both A and B
D.
neither A nor B


12.
Which of the following is not a valid unit of angular velocity?
A.
radians per second
B.
revolutions per minute
C.
degrees per hour
D.
gradients


13.
During a baseball pitch, a pitcher's arm rotates through 80 degrees of motion at the shoulder. If this is accomplished in 0.5 seconds, which of the following statements is true?
A.
angular velocity is constant
B.
angular acceleration is constant
C.
both A and B must be true
D.
neither A nor B must be true


14.
Which of the following is/are vector quantity(s)?
A.
angular velocity
B.
angular acceleration
C.
both A and B
D.
neither A nor B


15.
Which of the following are scalar quantities?
A.
angular distance
B.
angular velocity
C.
both A and B
D.
neither A nor B


16.
If angular acceleration is constant, which of the following is true of angular velocity?
A.
it must be constant
B.
it must be equal to zero
C.
it must be increasing
D.
none of the above


17.
A model airplane is being flown at the end of a cord 20 feet long. If the speed of the airplane remains constant, but the cord is shortened to 15 feet, what will be the effect on the radial acceleration of the airplane?
A.
it will increase
B.
it will decrease
C.
it will remain the same
D.
one must know the weight of the airplane in order to answer the question


18.
Range of motion at a joint is a measurement of what?
A.
linear displacement
B.
angular displacement
C.
linear velocity
D.
angular velocity


19.
Human body angles may be calculated using which of the following?
A.
goniometer
B.
flexometer
C.
electrogoniometer
D.
all of the above


20.
Which of the following quantities are equal?
A.
2π radians and 360°
B.
270° and 3/4 revolution
C.
both A & B
D.
none of the above


21.
When observing someone lift a heavy object, which of the following is likely to be the angle of interest regarding back injury?
A.
absolute angle of the trunk
B.
relative angle of the trunk
C.
absolute angle of the knee
D.
relative angle of the knee


22.
Why is anatomical knowledge important when using a goniometer?
A.
location of joint center determines placement of axis
B.
bone location affects position of the goniometer arms
C.
instant center of a joint can change during movement
D.
both A and B
E.
all of the above


23.
When the second hand on a clock makes a complete revolution, which of the following is/are true?
A.
angular distance is 360°
B.
angular displacement is 0°
C.
angular velocity is 6 deg/s
D.
both A and B
E.
all of the above


24.
If the knee joint goes through 100° of flexion during the down phase of a squat, what is the total angular distance during 10 complete squats?
A.
1000°
B.
2000°
C.
D.
none of the above


25.
A quadruple axel (in figure skating) involves how much angular displacement?
A.
4 revolutions
B.
1440°
C.
D.
none of the above


26.
Which of the following is a correct formula for angular velocity?
A.
σ = φ/t
B.
ω = φ/t
C.
ω = θ/t
D.
σ = θ/t


27.
Which of the following is/are correct units for angular speed?
A.
rpm
B.
deg/s
C.
rad/s
D.
both A and B
E.
all of the above


28.
What is the angular acceleration of the second hand on a clock after one complete revolution?
A.
6 deg/s2
B.
6 deg/s
C.
60 deg/s2
D.
0


29.
A procedure for identifying the direction of an angular motion vector is called what?
A.
right hand rule
B.
clockwise rule
C.
both A and B
D.
no special procedure is needed


30.
What does the letter “r” stand for in the equation v = rω?
A.
resultant
B.
radius of rotation
C.
radian
D.
none of the above


31.
What rules have to be followed when using the formula v = rω?
A.
units for ω have to be radian-based
B.
units for v and r must the same base units (with time included in “v”)
C.
both A and B
D.
there are no special rules


32.
The formula v = rω establishes the relationship between what?
A.
linear and angular displacement
B.
linear and angular velocity
C.
linear displacement and linear velocity
D.
angular displacement and angular velocity


33.
Which of the following is/are formula(s) for tangential acceleration?
A.
at = (vt - vt)/t
B.
at = rα
C.
both A and B
D.
none of the above


34.
Maximizing tangential acceleration is important in which of the following situations?
A.
punting a football for distance
B.
serving a tennis ball
C.
throwing a dart
D.
both A and B
E.
all of the above


35.
What component of angular acceleration represents the rate of change in direction of a rotation body?
A.
tangential acceleration
B.
radial acceleration
C.
linear acceleration
D.
none of the above


36.
When are radian-based units essential?
A.
when measuring linear velocity
B.
when measuring angular velocity
C.
when converting between linear and angular velocity
D.
all of the above


37.
Which of the following can contribute to the resultant linear velocity of a projectile at release?
A.
tangential acceleration
B.
radial acceleration
C.
both A and B
D.
none of the above


38.
Which of the following are appropriate units for tangential acceleration?
A.
rad/s
B.
m/s
C.
rad/s2
D.
m/s2


39.
Radial acceleration is directly affected by which of the following?
A.
tangential velocity
B.
radius of rotation
C.
both A and B
D.
none of the above


40.
When angular velocity is 0, what is angular acceleration?
A.
–9.81 m/s2
B.
increasing
C.
decreasing
D.
0
E.
need more information



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