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10 Cards in this Set
- Front
- Back
kinematics
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the description of motion
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kinetics
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deals with the causes of motion i.e. force and torques (moments)
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force coupling and give example
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internal forces of muscles acting synergistically causing a rotation. they work in pairs/ coupling
it's why the scapula rotates in arm abduction |
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are GRF's internal or external
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external
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what is the dip in the vertical ground reaction force during gait due to?
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as you move forward you bend down/ accelerate down briefly so like squatting on a scale you weigh less/ less force applied to force plate.
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how would you make the vertical GRF plateau instead of dipping down during walking/gait
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if kept leg streaight through stance phase you might be able to with no dipping b/c wouldn't be accelerating downwarsd
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what is impulse used for, what is it equal to, and how is it often calculated
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it's just another way to quantify the magnitude of loading.
impulse=force X time calculated often as teh integral/ area under the force-time curve |
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if somebody needed to decrease joint force, what is a simple thing to dot aht you could tell them
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slow down when you are walking b/c less joint force in loading b/c decrease in GRF. with increased speed you get more momentum and that equals increased GRF
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looking at GRF's how could you tell if somebody is runing at constant velocity or not
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by looking at anterior posterior forces (braking and propulsive impulses) . if they're equal then constant velocity. if braking phase is bigger than slowing down adn if propulsive (+) area/impulse is larger than speeding up
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is friction magnitue constant or variable, explain
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variable
until sliding occurs, friction magnitue is the motive force "limiting friction" once sliding occurs, friction mag decreases "sliding friction" |