Kinetics of Gait - Biomechanics

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What is commonly used to measure force in gait analysis?
Force platform
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What does Fx refer to?
Medial/lateral (frontal) direction
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What does Fy refer to?
Sagittal plane
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What does Fx refer to?
Transverse plane
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What is the maximum Fz force in walking?
1.25 bw
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What are the peaks in Fz walking gait?
Heel strike transient, before mid stance, before toe off
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What is the max posterior force during walking gait?
0.25 bw
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What is the maximal medial force during walking?
0.1 bw
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What is the maximal Fz force during running?
5 bw
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How does the magnitude of forces in running compare to running?
Much bigger
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How does the shape of GFR curves differ in walking and running?
Running is more spaced out
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What is the maximum posterior force in running?
0.5 bw
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What is the maximal medial force in running?
0.25 bw
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Is there a heel strike in fore foot strikers?
No
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In what order during both running and walking is the retarding phase and propulsion phase?
1. Retarding phase 2. propulsion phase in both
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On initial contact, what direction is the force in walking?
Anterior movement
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On initial contact, what direction is the force in running?
Posterior movement
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If there is an equal retarding and propulsion phase, what is it called?
Steady state
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If the propulsion phase is larger than the retarding phase, what is the gait called?
Propulsion gait
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If there is a net deceleration because there is more anterior force than posterior, what type of gait is it?
Slowing gait
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What is represented by the area underneath a force time curve?
Impulse and change in momentum
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What equation represents the law of acceleration?
F = (m2v2-m1v2)/t
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What acts parallel to where 2 surfaces contact during the motion of one surface relative to another?
Friction
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What is frictional force dependant on?
Normal reaction force (F) and coefficient of friction
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What is the coefficient of static friction?
When two objects are not moving relative to one another
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What is the coefficient of dynamic friction?
When 2 objects are moving relative to one another
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What is usually smaller, coefficient of static friction or dynamic friction?
Dynamic friction
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The coefficient of static friction is usually a...
Small number
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Friction opposes just the start of movement?
False
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Other cards in this set

Card 2

Front

What does Fx refer to?

Back

Medial/lateral (frontal) direction

Card 3

Front

What does Fy refer to?

Back

Preview of the front of card 3

Card 4

Front

What does Fx refer to?

Back

Preview of the front of card 4

Card 5

Front

What is the maximum Fz force in walking?

Back

Preview of the front of card 5
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