Soc 20: Levers

Question 1

What is a lever?

Answer 1

In your body, the term ‘lever’ refers to a system of muscles and bones working together to bring about movement.

Question 2

How does a lever work?

Answer 2

A lever is a structure that has four components:
1) Fulcrum - (or pivot) - the point around which the lever
rotates (joints).
2) Load - the force that is applied by the lever system
(resistance/ object).
3) Effort - a force that is applied by the user of the lever
system (muscles).
4) Lever arm - a rigid bar such as a bone.

Question 3

What is a Fulcrum?

Answer 3

(or pivot) - the point around which the lever
rotates (joints).

Question 4

What is a load?

Answer 4

the force that is applied by the lever system
(resistance/ object).

Question 5

What is a Effort?

Answer 5

a force that is applied by the user of the lever
system (muscles).

Question 6

What is a lever arm?

Answer 6

a rigid bar such as a bone.

Question 7

What shape is used to represent a Fulcrum?

Answer 7

Triangle

Question 8

What shape represents a load?

Answer 8

Square

Question 9

What image represents Effort

Answer 9

Arrow

Question 10

What image represents a lever arm?

Answer 10

Bar

Question 11

Diffrent types of Levers

Answer 11

● 1) First class
● 2) Second class
● 3) Third class

Question 12

How do we know which type of lever it is?

Answer 12

To recall the order of the levers use the term ‘FLE’ - this will help you to remember which part of the lever is in the middle.

First class lever - Fulcrum is in the middle.
Second class lever - Load is in the middle.
Third class lever - Effort is in the middle.

Question 13

First Class levers

Answer 13

The fulcrum sits in the middle, between the load and the effort.

Question 14

What class of Lever would a tricep dip be in?

Answer 14

First Class

Question 15

What class of lever is nodding your head?

Answer 15

First Class

Question 16

Second class levers

Answer 16

The load sits in the middle, between the fulcrum and the effort.

Question 17

What class of lever is calf raises?

Answer 17

Second Class

Question 18

What class of lever is lifting a wheelbarrow?

Answer 18

Second Class

Question 19

Third class lever

Answer 19

The effort sits in the middle, between the fulcrum and the load.

Question 20

What class of lever would be a bicep curl?

Answer 20

Third Class

Question 21

What class of lever would be using a spade?

Answer 21

Third class

Question 22

Michanical Advanatges

Answer 22

A large load can be lifted with a relatively
small amount of effort.

Question 23

Mechanical disadvantages

Answer 23

Third class levers cannot lift as heavy a load
with the same amount of effort, due to the position of
the effort and load from the fulcrum.