Question 1

The lower leg rotates with a constant angular velocity about the knee. Which of the following statements is true in this situation?

Accepted Answer

A)  The limb's angular acceleration is zero, but its centripetal acceleration and tangential acceleration are not zero 
B)  The limb's angular acceleration and centripetal acceleration are zero, but its tangential acceleration is not zero 
C)  The limb's angular acceleration is zero, its centripetal acceleration is not zero, and it's tangential acceleration is zero 
D)  The limb's angular acceleration, centripetal acceleration, and tangential acceleration are all zero 
E)  The limb's angular acceleration, centripetal acceleration, and tangential acceleration are all not zero

Question 2

The upper leg of a soccer player moves through 115 degrees in 0.46 seconds during the kicking of a soccer ball. What is the average angular velocity of the upper leg in this example?

Accepted Answer

The answer of The upper leg of a soccer player...

Question 3

Angular momentum is represented by the letter A

Accepted Answer

A) True 
 B)False

Question 4

The relationship between linear and angular distance is given by:

Accepted Answer

A)  s=rθ 
B)  v=rt 
C)  a=θr 
D)  s=v/t 
E)  s=vr

Question 5

Explain what is meant by the terms clockwise and anti-clockwise motion.

Accepted Answer

The answer of Explain what is meant by the terms...

Question 6

If an athlete is rotating in a tucked position during a dive (in the air) and they extend their arms, their angular velocity (rotation) about the axis of rotation will?

Accepted Answer

The answer of If an athlete is rotating in a...

Question 7

Determine the linear velocity of the three points from question 1.

Accepted Answer

The answer of Determine the linear velocity of the three...

Question 8

The moment of inertia of a 25kg mass rotating about a point 3.6m from the axis of rotation is:

Accepted Answer

A)  25×3.6 
B)  25²×3.6 
C)  25×25 
D)  25²×3.6² 
E)  25×3.6²

Question 9

During movement of the body, the total angular momentum possessed by the body (in the absence of any external force) remains constant

Accepted Answer

A) True 
 B)False

Question 10

if person A, who was 55kg, was sitting 1.7m from the fulcrum of a see-saw, try and balance the see-saw for a 75kg person sitting at the opposite side of the fulcrum from person A

Accepted Answer

The answer of if person A, who was 55kg, was...

Question 11

When rotating about a high bar a gymnast's centre of mass is 0.724 m away from the bar, and their body angle changes from 48° to 56.7° in 0.04 s. Calculate: i) the angular velocity in both deg/s and rad/s; and ii) the centripetal acceleration.

Accepted Answer

A)  218 deg/s, 3.80 rad/s & 10.43 m/s2 
B)  -218 deg/s, -3.80 rad/s & 10.43 m/s2 
C)  218 deg/s, -3.80 rad/s & 10.43 m/s2 
D)  218 deg/s, 3.80 rad/s & -10.43 m/s2 
E)  -218 deg/s, -3.80 rad/s & -10.43 m/s2

Question 12

36 degrees is 0.63 radians

Accepted Answer

A) True 
 B)False

Question 13

A pair of scissors is a good example of a second class lever.

Accepted Answer

A) True 
 B)False

Question 14

Angular momentum is defined as:

Accepted Answer

A)  weight x moment of inertia 
B)  moment of inertia x angular velocity 
C)  angular velocity x linear velocity 
D)  mass x linear velocity 
E)  weight x angular velocity

Question 15

Angular momentum is moment of inertia × angular velocity

Accepted Answer

A) True 
 B)False

Exam 3: Kinematics and Kinetics of Angular Motion

The lower leg rotates with a constant angular velocity about the knee. Which of the following statements is true in this situation?

The upper leg of a soccer player moves through 115 degrees in 0.46 seconds during the kicking of a soccer ball. What is the average angular velocity of the upper leg in this example?

Angular momentum is represented by the letter A

The relationship between linear and angular distance is given by:

Explain what is meant by the terms clockwise and anti-clockwise motion.

If an athlete is rotating in a tucked position during a dive (in the air) and they extend their arms, their angular velocity (rotation) about the axis of rotation will?

Determine the linear velocity of the three points from question 1.

The moment of inertia of a 25kg mass rotating about a point 3.6m from the axis of rotation is:

During movement of the body, the total angular momentum possessed by the body (in the absence of any external force) remains constant

if person A, who was 55kg, was sitting 1.7m from the fulcrum of a see-saw, try and balance the see-saw for a 75kg person sitting at the opposite side of the fulcrum from person A

When rotating about a high bar a gymnast's centre of mass is 0.724 m away from the bar, and their body angle changes from 48° to 56.7° in 0.04 s. Calculate: i) the angular velocity in both deg/s and rad/s; and ii) the centripetal acceleration.

36 degrees is 0.63 radians

A pair of scissors is a good example of a second class lever.

Angular momentum is defined as:

Angular momentum is moment of inertia × angular velocity