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Ligma > Angular Kinetics > Flashcards

Angular Kinetics Flashcards

Sugma

1
Q

Angular Kinetics

A

Concerned with rotational around an axis

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2
Q

Angular Momentum

A

A measure of the amount of angular motion possessed by a rotating body

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3
Q

Angular Momentum Equation

A

Moment of Inertia x angular velocity

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4
Q

Moment of inertia

A

The resistance of a rotating object to change its state of motion

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5
Q

Angular Velocity

A

The speed of rotation- can be altered by changing MOI as they have an inverse relationship

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6
Q

Relationship between A velocity and moment of inertia

A
  • Have an inverse relationship

- Velocity can be altered by changing the moment of inertia

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7
Q

Explain moment of inertia when in a tight tuck

A

If the mass of an object is distributed close to the axis of rotation, the MOI is small and it is easier to rotate the object

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8
Q

Explain moment of inertia when in a loose tuck

A

As the mass of an object moves further away from the axis of rotation, the MOI increases and rotation becomes harder

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9
Q

Equation for MOI

A

Mass of object x Radius of rotation

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10
Q

How to change moment of inertia

A

increase or decrease mass/ distribution of mass

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11
Q

When is mass a factor

A

Only when you can change mass prior to rotation

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12
Q

Radius of rotation

A

How the mass of the object is distributed about the axis of rotation

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13
Q

When does distribution of mass decrease MOI

A

when its closer to axis of rotation ie: top of raquet

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14
Q

Conservation of angular momentum

A

a rotating body will continue to turn about an axis of rotation with constant angular rotation unless an external force is applied to it

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15
Q

Eccentric force

A

a force that acts outside an objects centre of gravity, causing the object to rotate as well as move in a straight line (angular and linear motion)

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16
Q

eg of eccentric force

A

basketball free throw, putting back spin on the ball

17
Q

concentric force

A

Force applied to produce linear motion, eg hitting a flat serve in volleyball

18
Q

Torque

A

The turning effect created as a result of force being applied to an object outside its axis of rotation

19
Q

Formula for torque

A

size of the force x moment arm

20
Q

Moment arm

A

the distance between where the force is applied and where the torque (turning effect) occurs

21
Q

how to increase/decrease torque

A

Increase/decrease force applied

Increase/decrease length of moment arm

22
Q

explain torque in terms of a door

A

If you push a door near the hinges(where the torque is created) the moment arm is small and means less angular rotation is achieved when the same amount of force is applied

23
Q

Force couples

A

two equal but oppositely directed forces that cancel out linear motion and only produce angular motion

Ligma (19 decks)

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