Soc 20 - Lever System

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

What is a fulcrum

Answer 2

The point at which the lever rotates (JOINTS)

Question 3

What is a load

Answer 3

A force that is applied by the lever system. The load is the object you want to move, for example a dumbelk with your arm

Question 4

What is an effort

Answer 4

A force that is applied by the user of the lever system. The effirt supplied by your muscles

Question 5

3 different classes of levers

Answer 5

First class, second class, third class

Question 6

Acronym for class of lever

Answer 6

FLE

Question 7

FLE

Answer 7

• first class = fulcrum in middle
• second class = load in middle
• third class = effort in middle

Question 8

Example of first class lever

Answer 8

Tricep dip, heading a ball in football

Question 9

The tricep dip (first class)

Answer 9

In this example, the elbow is the fulcrum which sits between the load (weight of your body) and the effort applied by your tricep

Question 10

Example of second class lever system

Answer 10

Standing on your tip toes

Question 11

Standing on tip toes second class lever system

Answer 11

The body weight (load) sits between the toes (fulcrum) and the gastrocnemius muscles which is applying the effort

Question 12

Example of a third class lever system

Answer 12

The bicep curl

Question 13

Biceo curl - third class lever system

Answer 13

Effort is applied by the bicep which sits between the load (the dumbell) and the fulcrum (elbow joint)

Question 14

Mechanical advantgae

Answer 14

Output is greater than the input (load is greater than the effort) means the load can increase (1st and 2nd)

Question 15

Mechanical disadvantgae

Answer 15

Greater input than output