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Homework answers / question archive / 1) In gait, knee flexion and extension during the swing phase is largely due to actions at the hip
1) In gait, knee flexion and extension during the swing phase is largely due to actions at the hip. To examine this, one would conduct a...
a. General kinematic analysis
b. General kinetic analysis
c. Dependent kinematic analysis
d. Dependent kinetic analysis
e. Relative kinematic analysis
2. During forward progression, the anterior/posterior ground reaction force is typically an indication of:
a. The line of progression
b. The braking and the propulsion phases
c. Initial contact and heel strike only
d. 0.30 body weight
e. Negative impulse
3. During a front flip, if the individual tucks his/her legs, what will happen to the moment of inertia?
a. It will increase relative to the starting position
b. It will decrease relative to the starting position
c. It will increase as long as the forces are centric
d. It will decrease as long as the forces are eccentric
e. Not enough information to solve
b
4. If the initial contact of a vertical ground reaction force curve is 2 to 3 body weights, than the graphs characteristics must have:
a.A. A bimodal shape
b. B.Two peaks for initial contact
c. C. A passive peak only
d. D.An acceleration and deceleration peak
5. The dynamic coefficient of friction during walking and running can be calculated by:
a. A. Force in the anteroposterior direction/force in the vertical direction
b. B. Force in the anteroposterior direction/force in the mediolateral direction
c. C. Force in the anteroposterior direction + force in the vertical direction
d. D. Force in the anteroposterior direction/force in the vertical direction + force in the mediolateral direction
e. E. None of the above
6. If a quarterback (mass = 85 kg) is trying to obtain a first down and is running towards the first down marker a a 9 n/s, which an opposing linebacker (mass = 125 kg) tackles him head on with a velocity of -8.1/s. Which of the below observations is most correct?
a. A. The players will collide and fall directly to the ground
b. B. The quarterback will make the first down
c. C. The quarterback will not make the first down
d. D. The linebacker will continue moving with a positive velocity
e. E. Not enough information to solve
7. There is a discrepancy between the flight height recorded by the jump mat and the Vertec during the same jump where the Vertec height records a higher jump height. Potential explanations might be...
I. 1. The Vertec is more accurate than the jump mat
II 2. The jump mat is more accurate than the Vertec
II 3. Takeoff height did not equal landing height for jump mat
I 4. Incorrect initial stand and reach measurement for Vertec
aA. I
b B. II
c. C. I, III
d. D. III, IV
e. E. None of the above
8. The vertical speed at the instant of release directly determines
I. Height achieved from the ground
II. Time it takes to reach maximum height
III. How far a projectile travels
a. I
b. II
c. I, II
d. I, II, III
e. None of the above
9. Tangential velocity is parallel to the radius. If the object no longer travels in an arc the object will fly tangent to the arc at the instant of release.
A. Statement 1 is true, Statement 2 is true
B. Statement 1 is true, statement 2 is false
C. Statement 2 is false, statement 2 is false
D. Statement 2 is false, statement 2 is true
10. For a camera, light is recorded through a lens onto a(n)
a. MiniDV tape
b. DVD
c. CCD
d. Aperature
e. None of the above
11. Based on a standard cartesian coordinate system, a single point that is found at (-3, 3) must be located in which quadrant?
a. Quadrant IV
b. Quadrant III
c. Quadrant II
d. Quadrant I
e. Quadrant IV or II
12. In gait, knee flexion and extension during the swing phase is largely due to actions at the hip. To examine this, one would conduct a...
a. General kinematic analysis
b. General kinetic analysis
c. Dependent kinematic analysis
d. Dependent kinetic analysis
e. Relative kinematic analysis
