Test 2

Question 1

purpose overhand serve volleyball?

Answer 1

higher velocity, less flight time, keep it in bounds

Question 2

acceleration calculate

Answer 2

change velocity/time

Question 3

vertical acceleration

Answer 3

-9.8 m/s2

Question 4

vertical velocity @ apex

Answer 4

0 m/s

Question 5

horizontal acceleration

Answer 5

0 m/s2

Question 6

frame rate camera with 0.0167 secs between frames

Answer 6

1/x=0.0167s so 60 (x frame rate)

Question 7

endurance

Answer 7

trying to maintain it or our ability to exert force continually

Question 8

videography

Answer 8

quantifying movement through video

Question 9

5 phases of gait

Answer 9

heel strike, midstance, toe off, midswing,heel strike

Question 10

stance phase

Answer 10

HS, MSt, TO

Question 11

swing phase

Answer 11

TO, MSw, HS 40%

Question 12

double support

Answer 12

during hs and to 15% in each so 30%

Question 13

single support

Answer 13

mid stance 30%

Question 14

single pulley weight distribution

Answer 14

W=F

Question 15

two pulley weight distribution

Answer 15

F=1/2W

Question 16

CAM gives

Answer 16

varibale resistance try to match torque output as joing changes

Question 17

ang speed

Answer 17

total change angles distance/time

Question 18

ang velocity

Answer 18

angle displacement/time

Question 19

ang acc

Answer 19

rate of change of ang velocity

Question 20

kinetic chain

Answer 20

sequence of movement

Question 21

tangential velocity

Answer 21

angular velocity (radians/sec)time radius

Question 22

kinetic energy

Answer 22

energy due to motion K=1/2mv2

Question 23

potential energy

Answer 23

energy due to position ma(g)h

Question 24

strain energy

Answer 24

energy stored in material 1/2kx2 (stiffness constant, amount deformation)

Question 25

energy in pole vault

Answer 25

kinetic as run up, plant pole strain, come up potential

Question 26

jump height in pole vault

Answer 26

1/2mv2=ma(g)h–jump height

Question 27

purpose patella

Answer 27

increase angle of insertion determines how much force works on axis rotation

Question 28

strength curve for joint

Answer 28

moment arm length (Fm), force of muscle bc length muscle changing (Dm), moment arm for weight in hand (Dr)

Question 29

weak person

Answer 29

longer forearm with proximal insertion

Question 30

three phases of stretch shortening cycle

Answer 30

eccentric, coupling, concentric

Question 31

jump height given initial vertical velocity

Answer 31

impulse eq (Fxt=mv2-mv1 find v2 and plug into eq v2v2=v1v2+21vdv

Question 32

strength

Answer 32

max force that can be developed in a muscle (or group) during single max contraction

Question 33

endurance

Answer 33

maintaing max work effectiveness and resistance to fatigue

Question 34

power

Answer 34

avg force times avg velocity along line of action of that force, the capacity to continue prolonged exercises at a given intensity

Question 35

muscle force change as function length

Answer 35

lengthened state, minimal cross-briding but when length is too short the force decreases slightly b/c cross bridges bundle