Quiz #5 Flashcards
Gait Cycle: Average velocity (m/s)
1.37 m/s
Gait Cycle: Average velocity (m/min)
80-82 m/min
Gait Cycle: Average velocity Males (m/s)
1.43 m/s
Gait Cycle: Average velocity Males (m/min)
84-86 m/min
Gait Cycle: Average velocity Females (m/s)
1.28 m/s
Gait Cycle: Average velocity Females (m/min)
76-77 m/min
Gait Cycle: Minimum healthy velocity
1.2 m/s
Gait Cycle: Stride Length average
1.41 m
Gait Cycle: Stride Length Males
1.46 m
Gait Cycle: Stride Length Females
1.28 m
Gait Cycle: Cadence average
113 steps/min
Gait Cycle: Cadence Males
111 steps/min
Gait Cycle: Cadence Females
117 steps/min
Velocity = _ x _
stride length x 0.5 cadence
Stance phase
62%
Swing phase
38%
0-2% of gait cycle
Initial contact
- Floor contact is made with the heel
- Joint positions determine the limbs loading response
- Opposite limb is at the end of terminal stance
Initial contact
0-10% of gait cycle
loading response
10-30% of gait cycle
Mid stance
Objectives:
- progression over the stationary foot
- Limb and trunk stability
Mid stance
30-50% of gait cycle
Terminal stance
50-60% of gait cycle
Pre-swing
60-73% of gait cycle
Initial swing
73-87% of gait cycle
Mid-swing
87-100% of gait cycle
Terminal swing
Objectives:
- progression of body beyond the supporting foot
Terminal stance
Objectives:
- To position the limb for swing
Pre-swing
Objectives:
- Foot clearance of the floor
- Advancement of the limb from its trailing position
Initial swing
Objectives:
- Limb advancement
- Foot clearance from the floor
Mid-swing
Objectives:
- complete limb advancement
- Prepare the limb for stance
terminal swing
@ velocity formula
Vavi = (Pi+1 - Pi-1) / (Ti+1 - Ti-1)
Units for @ velocity method
m/s
@ velocity method: i = 2
- i = 1; Time 0.5, Position 7.0
- i = 2; Time 1.0, Position 9.0
- i = 3; Time 1.5, Position 5.0
Vav2 = (P2+1 - P2-1) / (T2+1 - T2-1)
Vav2 = (P3 - P1) / (T3-T1)
Vav2 = (5 - 7) / (1.5 - 0.5)
Vav2 = -2 m/s
Motion of bodies that have been projected into the air
Projectile Motion
Understanding _ _ helps in learning to control or predict what happens to an object when in the air
projectile motion
Relationship between displacement, velocity, and acceleration of a _
projectile
Projectiles: vertical displacement
Line makes big arch and goes below dotted line
Projectiles: vertical velocity
Line makes a straight diagonal line below dotted line
Projectiles: vertical acceleration
Line is straight and parallel below dotted line
Classes of projectiles
Inanimate and animate
Basic definitions of projectile motion
- Trajectory (parabola)
- Instant of release
- Instant of contact
Factors that influence the trajectory of a projectile
- Projection angle
- Projection speed
- Projection height
Factors that influence the trajectory of a projectile: Projection angle
- 0 degrees indicates a directly _ _
horizonatal projection
Factors that influence the trajectory of a projectile: Projection angle
- 90 degrees indicates a directly _ _
vertical projection
Factors that influence the trajectory of a projectile: Projection angle
- Between 0 and 90 degrees trajectory will be _
parabolic
Factors that influence the trajectory of a projectile: Projection speed
- Strongly influences the _ and _ of trajectory
height and length
Factors that influence the trajectory of a projectile: Projection speed
- _ _ at release (takeoff) determines
- height achieved after release
- time it takes to reach maximum height
- time it takes to fall back to the releases position
- the velocity of the object when it returns to release position
Vertical speed
Factors that influence the trajectory of a projectile: Projection speed
- _ _ at release (takeoff)
- in the absence of air resistance remains constant until the instant of contact
- along with time in the air determines horizontal distance (range)
- becomes smaller as the projection angle approaches 90 degrees
- becomes larger as the projection angle approaches 0 degrees
Horizontal speed
Factors that influence the trajectory of a projectile: Projection height
- Difference in vertical height between the _ _ _ and the _ _ _
- instant of release
- instant of contact
Factors that influence the trajectory of a projectile: Projection height
- Height at instant release _ height at instant of contact (soccer kick)
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Factors that influence the trajectory of a projectile: Projection height
- Height at instant release _ height at instant of contact (shot put)
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Factors that influence the trajectory of a projectile: Projection height
- Height at instant release _ height at instant of contact (free throw)
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