Question

Vertical Jump (mechanical impulse) 2. Below is a stylized version of a force-time graph for the vertical jump. The table shows the time and force values at key points on the graph. The subject weighs 600 N. Point a b c d e f g Time (s) 0.7 0.75 0.8 1.0 1.15 1.2 1.22 Force (N) 600 150 600 1900 1900 600 0 a c 600 b d e g a) Calculate how high this individual jumps. [8] b) At approximately what time does the jumper reach his lowest point in the countermovement? You do not need to be exact I am asking for an estimate. [2] c) Why is it difficult to visualize your answer to part b) when you look at such a graph? [1] d) At what point is maximal vertical velocity reached during this jump? [1] It is not point g, explain why not? [2] e) In Kin142 you had to do a vertical jump from a crouched position (i.e. no counter- movement). i) Does the jump depicted in the graph have a counter-movement? [1] ii) What is the rationale for this test protocol (i.e. why is the counter-movement not allowed)? [2] iii) Discuss the advantages and disadvantages of the protocol. [3] iv) In which jump (counter-movement or no counter-movement) would you jump the highest? Briefly explain why. [3]

          Vertical Jump (mechanical impulse)
2. Below is a stylized version of a force-time graph for the vertical jump. The table
shows the time and force values at key points on the graph. The subject weighs
600 N.
Point
a	b	c	d	e	f	g
Time (s)	0.7	0.75	0.8	1.0	1.15	1.2	1.22
Force (N)	600	150	600	1900	1900	600	0
a
c
600
b
d
e
g
a) Calculate how high this individual jumps. [8]
b) At approximately what time does the jumper reach his lowest point in the
countermovement? You do not need to be exact I am asking for an estimate. [2]
c) Why is it difficult to visualize your answer to part b) when you look at such a graph?
[1]
d) At what point is maximal vertical velocity reached during this jump? [1] It is not
point g, explain why not? [2]
e) In Kin142 you had to do a vertical jump from a crouched position (i.e. no counter-
movement).
i)	Does the jump depicted in the graph have a counter-movement? [1]
ii)	What is the rationale for this test protocol (i.e. why is the counter-movement
not allowed)? [2]
iii)	Discuss the advantages and disadvantages of the protocol. [3]
iv)	In which jump (counter-movement or no counter-movement) would you
jump the highest? Briefly explain why. [3]

Vertical Jump (mechanical impulse)
2. Below is a stylized version of a force-time graph for the vertical jump. The table
shows the time and force values at key points on the graph. The subject weighs
600 N.
Point
a b c d e f g
Time (s) 0.7 0.75 0.8 1.0 1.15 1.2 1.22
Force (N) 600 150 600 1900 1900 600 0
a
c
600
b
d
e
g
a) Calculate how high this individual jumps. [8]
b) At approximately what time does the jumper reach his lowest point in the
countermovement? You do not need to be exact I am asking for an estimate. [2]
c) Why is it difficult to visualize your answer to part b) when you look at such a graph?
[1]
d) At what point is maximal vertical velocity reached during this jump? [1] It is not
point g, explain why not? [2]
e) In Kin142 you had to do a vertical jump from a crouched position (i.e. no counter-
movement).
i) Does the jump depicted in the graph have a counter-movement? [1]
ii) What is the rationale for this test protocol (i.e. why is the counter-movement
not allowed)? [2]
iii) Discuss the advantages and disadvantages of the protocol. [3]
iv) In which jump (counter-movement or no counter-movement) would you
jump the highest? Briefly explain why. [3]

Added by Daniel T.

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