Question 1

Angular momentum is:

Accepted Answer

A)   moment of inertia + angular velocity
B)   angular velocity × linear velocity
C)   moment of inertia × radius of rotation
D)   moment of inertia × angular velocity
E)   angular velocity × angular acceleration D

Question 2

Which would have a higher moment of inertia value about the longitudinal (head to toe) axis of rotation: Arms out fully extended to the sides or one arm out to the side and one arm down by the side of the athlete?

Accepted Answer

With both arms out to the sides would have a larger moment of inertia about the longitudinal axis in this example. Moving more mass away from the axis of rotation (longitudinal axis) will increase r and hence increase I (moment of inertia).

Question 3

Angular Velocity is defined as Angular Acceleration divided by Time

Accepted Answer

A) True 
 B)False  False

Question 4

In a second class lever system there is a mechanical advantage in favour of:

Accepted Answer

A)   The resistance.
B)   The force.
C)   Both force and resistance.
D)   The fulcrum.
E)   Neither force or resistance.

Question 5

Anticlockwise rotation is the same direction as the movements of the hands of a clock

Accepted Answer

A) True 
 B)False

Question 6

Moments are measured in Newtons

Accepted Answer

A) True 
 B)False

Question 7

A tangent is defined as a line that touches a curve at a point and the line will have the same gradient (slope of a line measured as its ratio of vertical to horizontal change) as that of the curve at that point.

Accepted Answer

A) True 
 B)False

Question 8

An athlete has 980 kg.m²/s of angular momentum before and after a dive, and at entry to the water they have 0.7 rads/s angular velocity, what is their moment of inertia upon entry into the water?

Accepted Answer

The answer of An athlete has 980 kg.m²/s of angular...

Question 9

Explain what is meant by the term Tangential linear velocity.

Accepted Answer

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

Question 10

An oar for rowing (fulcrum fixed on the side of the boat) is a good example of a first class lever.

Accepted Answer

A) True 
 B)False

Question 11

Anti-clockwise rotation is the same direction as the hands of a clock

Accepted Answer

A) True 
 B)False

Question 12

The relationship between linear acceleration and angular acceleration is given by:

Accepted Answer

A)   a=rω
B)   a=v/t
C)   a=ɑr
D)   a=sr
E)   ɑ=ω/t

Question 13

Give three examples of changing moment of inertia within sporting performance

Accepted Answer

The answer of Give three examples of changing moment of...

Question 14

Angular velocity is measured in:

Accepted Answer

A)   degrees/s
B)   degrees x seconds
C)   degrees squared
D)   degrees
E)   radians

Question 15

Clockwise rotation is usually given a positive sign

Accepted Answer

A) True 
 B)False

Question 16

if you have 10 units of angular momentum when you start your movement, and in the absence of external torque, you will have 25 units of angular momentum when you stop your movement

Accepted Answer

A) True 
 B)False

Question 17

A shovel used to dig the garden is a good example of a third class lever.

Accepted Answer

A) True 
 B)False

Question 18

Explain what is meant by the term at a Tangent in this context of rotating bodies and linear velocity.

Accepted Answer

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

Question 19

Isaac Newton proposed three law's of motion

Accepted Answer

A) True 
 B)False

Question 20

If during the somersault (tucked) phase of the above question, the athlete had 34 rads/s angular velocity what would have happened to their moment of inertia? And finally what can you say about the two different moment of inertia values and why are they needed?

Accepted Answer

The answer of If during the somersault (tucked) phase of...

Exam 3: Kinematics and Kinetics of Angular Motion

Angular momentum is:

Which would have a higher moment of inertia value about the longitudinal (head to toe) axis of rotation: Arms out fully extended to the sides or one arm out to the side and one arm down by the side of the athlete?

Angular Velocity is defined as Angular Acceleration divided by Time

In a second class lever system there is a mechanical advantage in favour of:

Anticlockwise rotation is the same direction as the movements of the hands of a clock

Moments are measured in Newtons

A tangent is defined as a line that touches a curve at a point and the line will have the same gradient (slope of a line measured as its ratio of vertical to horizontal change) as that of the curve at that point.

An athlete has 980 kg.m²/s of angular momentum before and after a dive, and at entry to the water they have 0.7 rads/s angular velocity, what is their moment of inertia upon entry into the water?

Explain what is meant by the term Tangential linear velocity.

An oar for rowing (fulcrum fixed on the side of the boat) is a good example of a first class lever.

Anti-clockwise rotation is the same direction as the hands of a clock

The relationship between linear acceleration and angular acceleration is given by:

Give three examples of changing moment of inertia within sporting performance

Angular velocity is measured in:

Clockwise rotation is usually given a positive sign

if you have 10 units of angular momentum when you start your movement, and in the absence of external torque, you will have 25 units of angular momentum when you stop your movement

A shovel used to dig the garden is a good example of a third class lever.

Explain what is meant by the term at a Tangent in this context of rotating bodies and linear velocity.

Isaac Newton proposed three law's of motion

If during the somersault (tucked) phase of the above question, the athlete had 34 rads/s angular velocity what would have happened to their moment of inertia? And finally what can you say about the two different moment of inertia values and why are they needed?