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Biomechanics > Angular Kinetics > Flashcards

Angular Kinetics Flashcards

1
Q

What is Moment of Inertia and what is its symbol?

A

Symbol: I
Tendency of a body to resist changes in angular motion

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2
Q

What is the formula for Moment of Inertia?

A

I = m * (k)^2
Moment of Inertia = Mass * Radius of Gyration ^2

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3
Q

What is mass as it relates to inertia?

A

Measure of body’s linear inertia
more mass = more inertia

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4
Q

What is inertia

A

resistance to motion (specifically acceleration)

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5
Q

Centric forces cause what type of motion?

A

Linear (translational)

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6
Q

Eccentric forces cause which type of motion?

A

rotational (sometimes linear)

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7
Q

What is torque

A

turning or rotational effect of an eccentric force

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8
Q

what is another name for torque?

A

moment of force

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9
Q
A

Moment arm

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10
Q

What is a moment arm?

A

perpendicular distance from a forces line of action to the axis of rotation.

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11
Q

Units for Torque

A

N/m (SI)

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12
Q

Where do torques act?

A

about an axis of rotation

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13
Q

Longer moment arms require ________force while shorter moment arms require __________ force

A

less, more

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14
Q

Factors that influence torque

A

PCSA
Fiber Type
Muscle architecture
velocity
length
nervous system input

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15
Q

PSCA

A

Physiological Cross Sectional Area
area of a cross section of muscle perpendicular to its fibers

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16
Q

sum of torque at static equilibrium

A

0

17
Q

sum of T at dynamic equilibrium

A

moment of inertia * angular acceleration

18
Q

Center of Gravity

A

Imaginary point in the body about which weight is even distributed

19
Q

Center of Mass

A

The point about which all mass of the body is evenly distributed

20
Q

COG while airborne

A

location of axis of rotation

21
Q

Axis of rotation

A
22
Q

True or False: COG is a fixed point in the body

A

False COG can move within the body

23
Q

COG follows what type of path?

A

Parabolic

24
Q

Location of COG in children

A

Higher, larger heads

Biomechanics (11 decks)

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