Test Bank Chapter 11 Angular Kinematics of Human Movement

Basic Biomechanics, 8e (Hall)

Chapter 11 Angular Kinematics of Human Movement

1) If angular acceleration is constant, then angular velocity must be

A) constant.

B) increasing or decreasing.

C) equal to zero.

D) none of these answers is correct.

2) 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

3) What quantity will have the following units: rad/s?

A) linear displacement

B) angular displacement

C) linear velocity

D) angular velocity

4) 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 these answers is correct

5) Which angular direction is conventionally regarded as positive?

A) clockwise

B) counterclockwise

C) flexion

D) extension

6) 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 these answers are correct

7) 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 change in angular position over a given time and angular displacement divided by time

D) neither change in angular position over a given time nor angular displacement divided by time

8) 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

9) Which of the following are scalar quantities?

A) angular distance

B) angular velocity

C) both angular distance and angular velocity

D) neither angular distance nor angular velocity

10) Which of the following quantities are equal?

A) 2π radians and 360°

B) 270° and 3/4 revolution

C) both 2π radians and 360° and 270° and 3/4 revolution

D) none of these answers is correct

11) 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) 0°

D) none of these answers is correct

12) Which of the following is a correct formula for angular velocity?

A) σ = f/t

B) w = f/t

C) w = q/t

D) σ = q/t

13) Which of the following is/are correct units for angular speed?

A) rpm

B) deg/s

C) rad/s

D) both rpm and deg/s

E) all of these answers are correct

14) A procedure for identifying the direction of an angular motion vector is called what?

A) right hand rule

B) clockwise rule

C) both right hand rule and clockwise rule

D) no special procedure is needed

15) What does the letter "r" stand for in the equation v = rw?

A) resultant

B) radius of rotation

C) radian

D) none of these answers is correct

16) What rules have to be followed when using the formula v = rw?

A) units for w have to be radian-based

B) units for v and r must the same base units (with time included in "v")

C) both units for w have to be radian-based and units for v and r must the same base units (with time included in "v")

D) there are no special rules

17) The formula v = rw 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

18) Which of the following is/are formula(s) for tangential acceleration?

A) at = (vt - vt)/t

B) at = ra

C) both at = (vt - vt)/t and at = ra

D) none of these answers is correct

19) 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 these answers is correct

20) 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 these answers are correct

21) Which of the following can contribute to the resultant linear velocity of a projectile at release?

A) tangential acceleration

B) radial acceleration

C) both tangential acceleration and radial acceleration

D) none of these answers is correct

22) Radial acceleration is directly affected by which of the following?

A) tangential velocity

B) radius of rotation

C) both tangential velocity and radius of rotation

D) none of these answers is correct

23) The component of angular acceleration defined as the change in linear velocity for a body traveling on a curved path is what?

A) tangential acceleration

B) radial acceleration

C) angular acceleration

D) linear acceleration

24) Choose the term that describes "the precisely located center of rotation at a joint at a given instant of time."

A) radial acceleration

B) instant center

C) radius of rotation

D) tangential acceleration

25) Choose the term that describes the change in the angular position.

A) angular acceleration.

B) angular displacement

C) angular kinematics

D) angular kinetics

26) Choose the term that describes the unit of angular measure used in angular-linear kinematic quantity conversions.

A) radial acceleration

B) radian

C) radius of rotation

D) right hand rule

27) Choose the term that describes the rate of change in angular position.

A) angular kinetics

B) angular velocity

C) degree

D) instant center

28) Choose the term that describes the rate of change in angular velocity.

A) angular acceleration

B) angular displacement

C) angular kinematics

D) angular kinetics

29) Choose the term that describes the procedure for identifying the direction of an angular motion vector.

A) radial acceleration

B) radius of rotation

C) right hand rule

D) tangential acceleration

30) Choose the term that describes the distance from the axis of rotation to a point of interest on a rotating body.

A) radial acceleration

B) radian

C) radius of rotation

D) right hand rule

31) Choose the term that describes the component of angular acceleration of a rotating body directed toward the center of curvature.

A) radial acceleration

B) radian

C) radius of rotation

D) right hand rule

32) The clockwise direction in rotational motions is also considered a ________ direction.

33) A ________ is a unit of angular measurement equal to approximately 57.3°.

34) A ________ is a simple tool commonly used by clinicians to measure joint angles on human patients.

35) The symbols for linear kinematic quantities are English letters, whereas the symbols for angular kinematic quantities are ________ letters.

36) Provide 2 examples of relative angles and 2 examples of absolute angles and explain why each would be of importance.

37) Provide the formula which relates linear to angular velocity, including the rules that apply to the formula and an example in sport, dance or rehabilitation where the formula is applicable.

38) Explain the concept of instant center of rotation, including a discussion of why it is important when studying human motion.

39) Explain how to convert between degrees, radians and revolutions and give examples of when each would be appropriate units.

40) Explain tangential acceleration using an example in sport, dance or rehabilitation.

41) When solving problems related to linear/angular conversion, the units for angular displacement must be in revolutions.

42) If flexion of a joint is positive in direction when viewed from one side, the same motion will be negative in direction when viewed from the opposite side.

43) The most common unit of time is second.

44) Once a thrown ball is released, the tangential and radial acceleration become zero.