Applying Newton's laws to angular motion Flashcards

1
Q

What is Newton’s 1st law of ROTATION?

A

Law of inertia - an objects resistance to change its state of motion whilst rotating

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

Give an example of Newtons 1st law in rotation

A

An ice skater will continue to rotate in the air until they land. Here the ground exerts an external force (torque) which changes their state of angular momentum. A decrease in angular velocity around their longitudinal axis

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

What is a rotational force also known as?

A

An eccentric force or a torque

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

Define angular motion

A

Movement around a fixed point or axis

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

What is Newtons 2nd law of ROTATION?

A

Law of acceleration - the rate of change of angular momentum is directly proportional to the rotational force (torque) acting on it

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

Give an example of Newtons 2nd law of rotation

A

The faster a diver throws their head and arms forwards off a diving board, the greater their angular velocity will be around their transversal axis

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

What is Newtons 3rd law of ROTATION

A

Law of action/reaction - for every rotational action there is an equal and opposite rotational reaction

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

Give an example of Newtons 3rd law of rotation

A

When a netballer is stretching over a shot, their arms go upwards and fowards (anticlockwise) whereas their legs go backwards and upwards (clockwise)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

Define angular displacement

A

The smallest change in angle between the start and finish point

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

What is a radian?

A

53.7 degrees

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

What is the equation for angular velocity?

A

Angular velocity (rad/s) = angular displacement (rad) / time taken (s)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

Define angular acceleration

A

The rate of change of angular velocity

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

What is the equation for angular acceleration?

A

Angular velocity (rad/s) / time taken (s)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

It takes an ice skater 0.3 secs to rotate 140 degrees on the ice
a) calculate their angular velocity
b) calculate their angular acceleration

A

a) 140 / 57.3 = 2.4
2.4 / 0.3 = 8 radians/sec
b) 8/0.3 = 26.7 radians/sec squared

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

What are the three axis?

A
  1. Transversal = somersault
  2. Sagittal = cartwheel
  3. Longitudinal = pirouette
How well did you know this?
1
Not at all
2
3
4
5
Perfectly