Levers

Question 1

What is the rhyme you need to remember for levers

And what does it tell us?

Answer 1

1, 2, 3 F, R, E

The number tells us what class lever it is

The letter tells us what component is in the middle of the lever diagram
E.g. Fulcrum, Resistance/ Load, Effort

Question 2

What is the

Effort

Load

Fulcrum

Answer 2

Effort- carried out by the muscle

Load- resistance/ weight

Fulcrum- the joint

Question 3

What shapes are the fulcrum, load and effort?

Also where are they compared to the line?

Answer 3

Fulcrum- triangle (goes underneath)

Load- square (goes on top)

Effort- arrow (points up on 2nd and 3rd and down on 1st)

Question 4

What is mechanical advantage?

Answer 4

What makes a lever better than another
-its advantages

Question 5

What is the equation for mechanical advantage?

Answer 5

Effort arm / resistance arm

Question 6

How do you find the effort and resistance arms on a lever diagram

Answer 6

Effort arm- draw from the effort to the fulcrum

Resistance arm- draw from the resistance/ load to the fulcrum

Question 7

Which lever class has the highest mechanical advantage and why?

Answer 7

2nd class because… it has the highest MA

MA= Effort arm/ Resistance arm

2nd class levers have a higher effort arm than resistance arm.

Question 8

What do you need to remember for the movements/ parts of body the levers are?

Answer 8

1st class levers- extension of elbow

2nd class levers- ankle movements

3rd class levers- everything else