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Unit 1.3.b - linear motion, angular motion, fluid mechanics and projectile motion > angular motion > Flashcards

angular motion Flashcards

1
Q

What is angular motion

A

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 is an eccentric force

A

A force applied outside the CoM,resulting in angular motion

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3
Q

What is torque

A

A measurement of the turning(rotational or eccentric) force applied to a body

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4
Q

What is the principle of rotation

A

An imaginary line that passes through the CoM about which a body rotates,longitudinal,transverse and frontal axis

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5
Q

What is the longitudinal axis

A

Runs from head to toes through CoM

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6
Q

What is the transverse axis

A

Runs from left to right through CoM

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7
Q

What is the frontal axis

A

Runs from front to back through CoM

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8
Q

What axis does sagittal plane go with

A

transverse axis
-E.g. walking,squatting,overhead pass

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9
Q

What axis does frontal plane go with

A

frontal axis
-e.g. start jumps and side bends

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10
Q

What axis does transverse plane go with

A

Longitudinal axis
-E.g. hips in golf swing,shoulder in throwing

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11
Q

Example in longitudinal axis

A

spin,pirouette or full turn in trampolining

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12
Q

Example of transverse axis

A

Sommersault

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13
Q

Example of frontal axis

A

Cartwheels

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14
Q

What is the moment of inertia(MOI)

A

A body’s resistance to change it’s state of rotation
-The greater the mass of the body,the greater the MOI

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15
Q

What happens if MOI is high

A

If MOI is high,resistance to rotation is also high,therefore angular velocity is low:the rate of spin is slow

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16
Q

What happens if MOI is low

A

If MOI is low,resistance to rotation is also low,therefore angular velocity is high and the rate of spin is fast

17
Q

What is the conservation of angular motion

A

Angular motion is a conserved quantity which remains constant unless an external force or torque is applied

18
Q

What is the angular analogue of newtons first law of motion

A

The angular equivalent of newtons first law of motion,which states a rotating body will continue to turn about its axis of rotation with constant angular momentum unless acted upon by an eccentric force or external torque

19
Q

What is angular velocity

A

The rate of change in angular displacement simply rate of rotation

20
Q

Equation for angular velocity

A

angular displacement/time taken
-Rad/s

21
Q

What is the moment of inertia

A

Resistance of a body to change its state of angular rotation

22
Q

MOI equation

A
  • sum of M x r squared
    -Kgm squared
23
Q

Angular momentum equation

A

MOI x angular velocity
-kgm2rad/s

Unit 1.3.b - linear motion, angular motion, fluid mechanics and projectile motion (2 decks)

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