Angular Motion Flashcards

1
Q

What is angular motion?

A

The movement of a body or part of a body in a circular path about an axis of rotation

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2
Q

What force causes angular motion?

A

An eccentric force, a force applied outside of a bodies centre of mass

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3
Q

What is torque?

A

The measurement of the turning force applied to a body

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4
Q

What are the principle axes of rotation?

A

If an eccentric force is applied to a body, it will rotate around one of three principles:
- Longitudinal
- Transverse
- Frontal

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5
Q

What is the longitudinal axis?

A

The axis that runs from head to toe through the centre of mass, allowing a spinning action

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6
Q

What is a sporting example of a skill on the longitudinal axis?

A

A full turn in trampolining

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7
Q

What is the transverse axis?

A

Runs from left to right through the centre of mass

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8
Q

What is a sporting example of a skill on the transverse axis?

A

An overhead kick in football

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9
Q

What is the frontal axis?

A

Runs from front to back through the centre of mass

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10
Q

What is a sporting example of a skill on the frontal axis?

A

Performing actions such as a cartwheel

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11
Q

What are the 3 most important angular motion descriptors?

A
  • Angular velocity
  • Moment of inertia
  • Angular momentum
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12
Q

What is angular distance?

A

Total angle a body turns through from start to finish positions when rotating about an axis

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13
Q

What is angular displacement?

A

The smallest angle between the start and finishing positions of a body rotating about an axis

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14
Q

What is angular speed?

A

Rate of change in angular distance

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15
Q

What is angular acceleration?

A

Rate of change in angular velocity

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16
Q

What is a radian?

A

A measurement that is the angle from the centre of a circle, which intercepts the arc equal in length to the radius of a circle

17
Q

How many radians is angular motion?

A

2pi Rads

18
Q

What is angular velocity?

A

The rate of change in angular displacement

19
Q

What is the moment of inertia?

A

The resistance of a body to change its state of angular motion or rotation

20
Q

How is the moment of inertia calculated?

A

Mass x Distribution of mass from the axis of rotation^2

21
Q

What factors affect the size of inertia?

A

The distribution of mass and the mass of the body

22
Q

What is angular momentum?

A

The quantity of angular motion possessed by a body

23
Q

How is angular momentum calculated?
What is its unit?

A

Moment of inertia x angular velocity
KgM^2rad/s

24
Q

What is the conservation of angular momentum?

A

Once created it is constant. If inertia increases, angular velocity must decrease (vice versa)

25
Q

Define the conservation of angular momentum?

A

“A rotating body will continue to turn about its axis of rotation with constant angular momentum unless acted on by an eccentric force”