Section 2 - Movement analysis Flashcards Preview

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Flashcards in Section 2 - Movement analysis Deck (19):
1

What is a lever ?

a solid bar that moves around a fixed point when force is applied to it

2

What are the 3 components to a lever ?

Fulcrum - (pivot) where the movement occurs usually a joint

Effort - (force) where the force is applied to one part of the effort

Load - (resistance) is at the other end working against the force of the effort

3

What is the 1st class and an example ?

Load - Fulcrum - Effort

head - joint between cranium & vertebra - back muscles

e.g. neck extension (heading in football)

4

What is the 2nd class and an example ?

Fulcrum - Load - Effort

toe joint - body weight - gastrocnemius

e.g. plantar / dorsi flexion (standing on toes to jump)

5

What is the 3rd class and an example ?

Load - Effort - Fulcrum

weight of hand + weight - force of bicep - elbow joint

e.g. elbow flexion (lifting a weight)

6

How do you calculate Mechanical Advantage ?

mechanical advantage = effort arm / weight arm

7

When does a first class lever have a mechanical advantage ?

if the fulcrum is closer to the load than the effort

8

Second class levers always have a mechanical advantage, why ?

the effort arm is always longer than the weight arm

9

Third class levers always have a mechanical disadvantage, why ?

the effort arm is always shorter than the weight arm

10

When does a first class lever have a mechanical disadvantage ?

if the fulcrum is closer to the effort than the load

11

What is a mechanical advantage ?

when a lever can move a large load with a small effort from the muscle

12

What is a mechanical disadvantage ?

a large effort from the muscles to move a small load

13

Where does movement happen ?

planes

14

What are the 3 planes ?

sagittal - divides the body into left and right

transverse - divides the body into top and bottom

frontal - divides the body's front and back

15

What does movement happen around ?

axes

16

What are the 3 types of axis ?

sagittal - runs through the body from front to back

longitudinal - runs through the body from top to bottom

transverse - runs through the body from left to right

17

What type of plane and axis does flexion / extension use ?

sagittal and transverse

e.g. tuck and pike somersaults, running, forward roll

18

What type of plane and axis does abduction / adduction use ?

frontal and sagittal

e.g. cartwheel

19

What type of plane and axis does rotation use ?

transverse and longitudinal

e.g. ice skating spin , discus throw rotation