Review 5 (Angular Kinematics)

Question 1

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?

Question options:

1) Angular velocity is constant

2) Angular acceleration is constant

3) Both A and B

4) None of the above

Answer 1

None of the above

Question 2

Range of motion at a joint is a measurement of which of the following?

Question options:

1) Angular displacement

2) Linear displacement

3) Linear velocity

4) Angular velocity

Answer 2

Angular displacement

Question 3

Human body angles may be calculated using which of the following?

Question options:

1) Goniometer

2) Flexometer

3) Electrogoniometer

4) All of the above

Answer 3

All of the above (Goniometer, Flexometer & Electrogoniometer)

Question 4

Why is anatomical knowledge important when using a goniometer?

Question options:

1) Location of joint centre determines placement of axis

2) Bone location affects position of the goniometer arms

3) Instant centre of a joint can change during movement

4) All of the above

Answer 4

All of the above (Location of joint centre determines placements of axis, Bone location affects position of the goniometer arms & Instant centre of a joint can change during movement)

Question 5

If the knee joint goes through 100° of flexion during the down phase of a squat, which of the following is the total angular distance during 10 complete squats?

Question options:

1) 0°

2) 1000°

3) 2000°

4) None of the above

Answer 5

2000°

Question 6

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

Question options:

1) at = (vt - vt)/t

2) at = rα

3) Both formulas are correct.

4) Neither of the formulas is correct.

Answer 6

Both formulas are correct (at = (vt - vt)/t) & (at = rα)

Question 7

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

Question options:

1) Radial acceleration

2) Tangential acceleration

3) Both tangential and radial acceleration

4) None of the above

Answer 7

Both tangential and radial acceleration

Question 8

When observing someone lift a heavy object, which of the following is likely to be the angle of interest regarding back injury?

Question options:

1) Absolute angle of the knee

2) Relative angle of the trunk

3) Absolute angle of the trunk

4) Relative angle of the knee

Answer 8

Absolute angle of the trunk

Question 9

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

Question options:

1) Right hand rule

2) Clockwise rule

3) Both A and B

4) No special procedure is needed.

Answer 9

Right hand rule

Question 10

Which of the following is NOT a valid unit of angular velocity?

Question options:

1) Revolutions per minute

2) Gradients

3) Degrees per hour

4) Radians per second

Answer 10

Gradients

Question 11

If the angular velocity of a batter’s shoulders increases, which of the following will happen to the linear velocity of the end of the bat?

Question options:

1) Increase

2) Decrease

3) End of the bat has no linear velocity

4) Stay the same

Answer 11

Increase

Question 12

What does the letter “r” stand for in the equation v = rω?

Question options:

1) Radius of rotation

2) Revolution

3) Radian

4) Resultant

Answer 12

Radius of rotation

Question 13

What is the angular acceleration of the second hand on a clock after one complete revolution?

Question options:

1) 6 deg/s

2) 0

3) 6 deg/s2

4) 60 deg/s2

Answer 13

0

Question 14

Which of the following terms describes the location of the centre of rotation at a joint at a given instant in time?

Question options:

1) Precise centre

2) Exact centre

3) Instant centre

4) None of the above

Answer 14

Instant centre

Question 15

A joint angle formed by adjacent body segments relative to each other is what type of angle?

Question options:

1) Obtuse angle

2) Acute angle

3) Absolute angle

4) Relative angle

Answer 15

Relative angle

Question 16

A model airplane is being flown at the end of a cord 10 m long. If the speed of the airplane remains constant, but the cord is shortened to 7 m, which of the following will be the effect on the radial acceleration of the airplane?

Question options:

1) It will remain the same.

2) One must know the weight of the airplane in order to answer the question.

3) It will increase.

4) It will decrease.

Answer 16

It will increase.

Question 17

An angle formed by a body segment with respect to horizontal is which of the following?

Question options:

1) Absolute angle

2) Acute angle

3) Relative angle

4) None of the above

Answer 17

Absolute angle

Question 18

If angular acceleration is constant, then angular velocity must be

Question options:

1) Increasing or decreasing

2) Equal to zero

3) None of the above

4) Constant

Answer 18

Increasing or decreasing

Question 19

Which of the following expressions defines angular velocity?

Question options:

1) Angular displacement divided by time

2) Change in angular position over a given time

3) Both A and B

4) None of the above

Answer 19

Both A and B (Angular displacement divided by time & Change in angular position over a given time)

Question 20

If angular velocity is the same for both swings, which golf club will have a greater linear velocity at the club head, the driver (longer club) or the 9-iron?

Question options:

1) Equal linear velocity

2) Driver

3) 9-iron

4) Need more information

Answer 20

Driver

Question 21

Which of the following are appropriate units for tangential acceleration?

Question options:

1) rad/s

2) m/s^2

3) rad/s^2

4) m/s

Answer 21

m/s^2

Question 22

Which of the following terms describes the angle formed between the longitudinal axes of two adjacent body segments?

Question options:

1) The absolute angle

2) The relative angle

3) The static angle

4) None of the above

Answer 22

The relative angle

Question 23

What rules have to be followed when using the formula v = rω?

Question options:

1) Units for ω have to be radian-based.

2) Units for v and r must the same base units (with time included in “v”).

3) Both A and B

4) There are no special rules.

Answer 23

Both A and B (Units for ω have to be radian-based & Units for v and r must the same base units [with time included in “v”].)

Question 24

The formula v = rω establishes the relationship between which of the following?

Question options:

1) Linear and angular velocity

2) Linear displacement and linear velocity

3) Linear and angular displacement

4) Angular displacement and angular velocity

Answer 24

Linear and angular velocity

Question 25

Radial acceleration is directly affected by which of the following?

Question options:

1) Tangential velocity

2) Radius of rotation

3) Both tangential velocity and radius of rotation

4) None of the above

Answer 25

Both tangential velocity and radius of rotation

Question 26

Which of the following is/are true regarding a radian?

Question options:

1) It is equal to 57.3 degrees

2) It is the size of the angle subtended by an arc of radius length

3) It is a unit of angular displacement

4) All of the above

Answer 26

All of the above
(It is equal to 57.3 degrees, It is the size of the angle subtended by an arc of radius length & It is a unit of angular displacement)

Question 27

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

Question options:

1) rpm

2) deg/s

3) rad/s

4) All of the units are correct of angular speed.

Answer 27

All of the units are correct of angular speed (rpm, deg/s & rad/s)

Question 28

Which of the following is/are scalar quantities?

Question options:

1) Angular distance

2) Angular velocity

3) Both A and B

4) None of the above

Answer 28

Angular distance

Question 29

When the second hand on a clock makes a complete revolution, which of the following is/are true?

Question options:

1) Angular velocity is 6°/s

2) Angular displacement is 0°

3) Angular distance is 360°

4) Both the angular distance is 360° and the angular displacement is 0°

Answer 29

Both the angular distance is 360° and the angular displacement is 0°

Question 30

Which angular direction is conventionally regarded as positive?

Question options:

1) Counterclockwise

2) Extension

3) Flexion

4) Clockwise

Answer 30

Counterclockwise

Question 31

When are radian-based units essential?

Question options:

1) When measuring linear velocity

2) When measuring angular velocity

3) When converting between linear and angular velocity

4) All of the above

Answer 31

When converting between linear and angular velocity

Question 32

Which of the following is true regarding the movement of the second hand on a clock over a period of one minute?

Question options:

1) Angular velocity is zero.

2) Angular acceleration is positive.

3) Angular velocity is constant.

4) Angular distance is equal to angular displacement.

Answer 32

Angular velocity is constant.

Question 33

Which of the following is/are vector quantities?

Question options:

1) Angular velocity

2) Angular acceleration

3) Both A and B

4) None of the above

Answer 33

Both A and B (Angular velocity & Angular acceleration)

Question 34

Which of the following quantities are equal?

Question options:

1) 2π radians and 360°

2) 270° and 3/4 revolution

3) Both quantities are equal.

4) Neither of the quantities are equal.

Answer 34

Both quantities are equal (2π radians and 360° & 270° and 3/4 revolution)

Question 35

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

Question options:

1) Linear displacement

2) Angular displacement

3) Angular velocity

4) Linear velocity

Answer 35

Angular velocity

Question 36

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

Question options:

1) ω = φ/t

2) σ = φ/t

3) ω = θ/t

4) σ = θ/t

Answer 36

ω = θ/t

Question 37

The component of angular acceleration directed toward the center of curvature defines which of the following?

Question options:

1) Tangential acceleration

2) Radial acceleration

3) Angular acceleration

4) Linear acceleration

Answer 37

Radial acceleration

Question 38

What component of angular acceleration represents the rate of change in direction of a rotation body?

Question options:

1) None of the above

2) Linear acceleration

3) Radial acceleration

4) Tangential acceleration

Answer 38

Radial acceleration

Question 39

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

Question options:

1) Linear acceleration

2) Angular acceleration

3) Tangential acceleration

4) Radial acceleration

Answer 39

Tangential acceleration

Question 40

When angular velocity is 0, which of the following is angular acceleration?

Question options:

1) Increasing

2) –9.81 m/s2

3) 0

4) Decreasing

Answer 40

0