Chapter 2 Flashcards by Courtney Paulson | Brainscape

Q

function of a synergist

A

indirectly assists in movement

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Q

definition of torque

A

degree to which force rotates object around fulcrum

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Q

what is a first class lever

A

force-fulcrum-resistive force

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Q

example of a first class lever

A

elbow extension

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Q

what is a second class lever

A

force-resistive force-fulcrum

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Q

example of a second class lever

A

plantar flexion

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Q

what is a third class lever

A

fulcrum-applied force-resistive force

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Q

example of a third class lever

A

elbow flexion

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Q

to be at mechanical advantage…

A

the force must be greater then the resistance

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Q

what is a mechanical advantage

A

> 1.0

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Q

what is mechanical disadvantage

A

<1.0 -> MC

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Q

definition of acceleration

A

change in velocity per unit time

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Q

what is work

A

force x displacement

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Q

what is power

A

work / time; “explosive strength”

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Q

what is positive work

A

concentric contraction

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Q

what is negative work

A

eccentric contraction

Q

what is recruitment

A

of motor units involved in contraction

Q

what is rate coding

A

rate at which a motor unit is fired

Q

what action is concentric

A

lifting movement

Q

what action is eccentric

A

lowering movement

Q

what is isometric

A

no movement