3.2.2.2 Levers

Question 1

lever

Answer 1

rigid bar rotating round fixed point
movement by a turning motion round fixed point

fulcrum, effort and load/resistance

Question 2

2 main functions of levers

Answer 2

1. increase resistance/load that given effort can move (adv) = 2nd & 1st
2. increase speed at which body moves (dis) 3rd & 1st

Question 3

FLE

Answer 3

123

Question 4

mechanical advantage equation

Answer 4

effort arm divided by resistance arm

Question 5

mechanical advantage

Answer 5

> 1
increase effect of effort force = move larger loads
effort arm longer than resistance arm
1st and 2nd

Question 6

mechanical disadvantage

Answer 6

< 1
increase speed of which a body moves/range of movement = move objects faster
resistance arm is longer than effort arm
1st and 3rd

Question 7

diagrams

Answer 7

with effort arrow

arrow head cant be on line (has to point up or down)

Question 8

1st class lever

Answer 8

fulcrum in middle
mech dis at tricep (extension of elbow)

head & neck = flexion/extension
elbow = extension

Question 9

2nd class lever

Answer 9

load in middle
plantar flexion ankle
mech adv

Question 10

3rd class lever

Answer 10

hip, knee, elbow (bicep)

mech dis

Question 11

fulcrum, effort, load

Answer 11

bones = lever 
joint = fulcrum 
muscles = effort 
weight = resistance/load