exam

Question 1

impulse

Answer 1

the application of force over a period time to change the momentum of an object

Question 2

external forces

Answer 2

gravity
friction
air resistance
water resistance

Question 3

simultaneous summation of force/momentum

Answer 3

all body parts move at the same time to produce a force. can be used for both accuracy and power, golf putting and weightlifting

Question 4

sequential summation of force/momentum

Answer 4

where body parts are moved in a sequence to produce maximum force, used in striking sports

Question 5

successful summation of force/momentum

Answer 5

stronger and larger muscles in the legs move first followed by the smaller and faster muscles. each body part is sequentially accelerated by each body part so that the optimum momentum passes from one body part to the next. as many body parts as possible are used so that the force can applied over the maximum possible time. follow through is important to prevent deceleration of last segment and safe dissipation of force, in the direction of the applied force.

Question 6

mass

Answer 6

amount of matter object is made up of, which never changes unlike weight which changes with gravity

Question 7

inertia

Answer 7

reluctance to change its state of motion, either trying to move or stop something from moving

Question 8

momentum

Answer 8

describe the amount of motion an object has

Question 9

conservation of angular momentum

Answer 9

a spinning body will continue spinning indefinitely unless an external force acts upon it, is always constant however moment of inertia and angular velocity can change

Question 10

principle of diminishing returns

Answer 10

performers in the early stages of learning will have the most rapid improvement in response to exercise, as the performer becomes more competent and progresses to later stages of learning the rate of improvement will decrease in response to practise.

Question 11

factors affecting projectile motion

Answer 11

angle of release, height and speed of release

Question 12

acceleration

Answer 12

positive (speeding)
negative (slowing down)
zero( constant or not moving)

Question 13

low GI foods

Answer 13

before (1-4hr) events and after (1-24hours)

Question 14

high GI foods

Answer 14

during or immediately after

Question 15

Passive recovery

Answer 15

PC 30 sec for 70%, having a high aerobic system speeds this up

Question 16

active recovery

Answer 16

when over LIP, accumulate H+ ions

Question 17

nutritional and rehydration recovery strategies

Answer 17

carbohydrate replenishment- consume high GI foods within 30-45min after exercise
protein replenishment- reccomended to consume 30-40 g after exercise for 48 hours, eat carbs and protein together.
water- 1.5L per kg lost within first 2 hours. drink spoet drinks as they rehydrate and replenish glycogen stores and electrolytes