Levers

Question 1

What is the fulcrum in a body lever ?

Answer 1

Joint

Question 2

What is the resistance in a body lever ?

Answer 2

Load/ weight

Question 3

What is the effort in a body lever ?

Answer 3

Muscle

Question 4

What is the lever known as in the body ?

Answer 4

Limb

Question 5

What is the rhyme to remeber which class a lever is ?

Answer 5

1 2 3
F R E
(how to remember what is in the centre of the lever)

Question 6

What is the most common type of lever ?

Answer 6

3rd class

Question 7

What is the definition of a regular lever ?

Answer 7

A rigid. bar that rotates around a fixed point and it is used to apply a force against a resistance

Question 8

What kind of actions are used for a third class lever ?

Answer 8

Running, Jumping, Kicking
Use of hamstring or biceps

Question 9

What is an example of when a 2nd class lever is used ?

Answer 9

Going onto your tiptoes on the beam
Fulcrum = joint at the toes
Effort = gastrocnemius
Resistance = body weight goes through the middle of the foot

Question 10

What is the effort arm ?

Answer 10

Distance between the fulcrum and the effort

Question 11

What is the resistance arm ?

Answer 11

Distance between the fulcrum and resistance

Question 12

What is mechanical disadvantage ?

Answer 12

When the resistance arm is greater than the effort arm

Question 13

What is mechanical advantage ?

Answer 13

When the effort arm is longer than the resistance arm

Question 14

What are the advantages and disadvantages of a second class lever ?

Answer 14

Advantage = large forces lift the whole body weight
Disadvantage = slow, with a limited range of movement

Question 15

What are the advantages and disadvantages of first and third class levers ?

Answer 15

Advantages = large range of movement, resistance is moved quickly
Disadvantage = cannot apply much force to move an object