Deck 22: Instrumentation for Motion Analysis

Question 1

Volleyball players are taught to dive and roll when attempting to hit a low ball on the run. Explain the purpose of the roll in this dive and roll maneuver.

Answer 1

decelerate over longer time, less force applied, prevent injury

Question 2

What should you do when landing from a jump to decrease the amount of force acting on the body?

A) decrease the time, increase the distance
B) decrease the time, decrease the distance
C) increase the time, increase the distance
D) increase the time, decrease the distance.

Answer 2

increase the time, increase the distance

Question 3

Which of the following determines the amount of force required to stop an object in motion?

A) the mass of the object and the time of force application
B) the velocity of the object and its weight
C) the momentum of the object and the time of force application
D) the initial acceleration of the object

Answer 3

the momentum of the object and the time of force application

Question 4

Where should the line of gravity be located when receiving impact from an object with a large horizontal velocity?

A) centered over the base of support
B) near the front edge of the base of support
C) near the back edge of the base of support
D) in any comfortable position

Question 5

List the primary considerations in considering the effects of impact on the body.

Question 6

How might one decrease the force acting on any given part of the body when falling?

A) put the hands out to break the fall
B) decrease the area that contacts the ground
C) increase the area that contacts the ground
D) decrease both area of contact and time of contact

Question 7

What type of muscular contraction is primarily responsible for the reception of a hard thrown ball?

A) concentric
B) eccentric
C) synergistic
D) static

Question 8

How should the base of support be in order to maintain balance when landing from a jump or fall?

A) enlarged in a direction opposite the movement
B) decreased as much as possible
C) maintained at the original size
D) enlarged in the direction of the movement

Question 9

How would you dissipate energy when catching a fast-pitched hard ball?
Explain the rationale for your answer.

Question 10

What effect does tucking and doing a shoulder roll have during a fall?

A) maintaining the horizontal velocity
B) gradually decreasing the horizontal velocity
C) helping to regain balance
D) keeping the arms free from injury

Question 11

Which of the following would be good advice for landing from a vertical jump?

A) flex the knees, hips, and ankles
B) land on a soft surface
C) step forward on landing
D) all of the above
Short Answer Questions

Question 12

How much work must be done on a medicine ball in order to catch it and completely stop its motion?

A) work equal to the change in kinetic energy of the ball
B) work equal to the force of the throw
C) work equal to the mass of the object
D) work equal to the weight and velocity of the object

Question 13

Why do you land harder the farther you fall?

Question 14

Pole vaulters used to land in a sand pit. They now land in a deep foam pad. Explain in kinesiological terms the effect this change has had on the safety of pole vaulting.

Question 15

Among other things what does the concept of "giving" to catch something involve?

A) flexing the elbow at contact
B) extending the elbow at contact
C) keeping the elbow rigid at contact
D) none of the above