SOC 20-Lever Systems

Question 1

What are the three types of levers ?

Answer 1

First class levers
Second class levers
Third class levers

Question 2

Fulcrum

Answer 2

The point around which the level rotates

Question 3

Load

Answer 3

The force that is applied by the lever system ( e.g. dumbbell )

Question 4

Effort

Answer 4

A force that is applied by the user of the Lever system (supplied by muscles)

Question 5

First class lever

Answer 5

Fulcrum is in the middle

Question 6

Second class lever

Answer 6

Load is in the middle

Question 7

Third class lever

Answer 7

Effort is in the middle

Question 8

Lever arm

Answer 8

A rigid bar such as a bone

Question 9

What is a lever ?

Answer 9

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

Question 10

Lever system in the body (exercise)

Answer 10

When you exercise your muscles pull on your bones and your bones create movement acting as levers

Question 11

First class lever system exercise

Answer 11

Tricep dip

Question 12

First class lever system example

Answer 12

Heading in football
Neck muscles provide effort
Head + ball (load)
Top of your spine (fulcrum)

Question 13

Second class lever system exercise / example

Answer 13

A calf raise
Body weight - load
Ball of your feet (fulcrum)
Gastrocnemius (effort)

Question 14

Which lever system is most common

Answer 14

Third class lever system

Question 15

Third class lever system exercise / example

Answer 15

Dumbbell bicep curl
Effort - biceps
Fulcrum - elbow
Load - dumbbell

Question 16

Calculating mechanical advantage

Answer 16

Divide the input by the output

Question 17

When does a mechanical advantage happen ?

Answer 17

When the output of the lever is greater than the input
When the load is greater than the effort

Question 18

Which lever system works at a mechanical advantage?

Answer 18

First and second class levers

Question 19

When does a mechanical disadvantage happen ?

Answer 19

When the effort and the load are both the same side of the fulcrum but the effort sits closer to the fulcrum than the load does.

Question 20

Which lever system works at a mechanical disadvantage?

Answer 20

Third class levers