SOC 20

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

Four components of a lever system

Answer 2

Fulcrum
Effort
Load
Lever arm

Question 3

First class lever

Answer 3

Fulcrum is in the middle

Question 4

Second class lever

Answer 4

Load is in the middle

Question 5

Third class lever

Answer 5

Effort is in the middle

Question 6

Example of first class lever

Answer 6

Tricep dip

Question 7

Example of second class lever

Answer 7

Calf raise

• the load sits between the toes and ball of the feet (fulcrum and the calf muscles apply the effort

Question 8

Example of third class lever

Answer 8

Bicep curl

-effort is applied by the bicep muscle, which is between the fulcrum at the elbow joint and the weight in your hands

Question 9

Mechanical advantage

Answer 9

This happens when the output of the lever is greater than the input

Question 10

Mechanical disadvantage

Answer 10

In this case, the input of the lever is greater than the output - the force you apply is greater than the load so you are putting in more than you are getting out

Question 11

What levers are at a mechanical advantage?

Answer 11

First and second class levers

Question 12

What levers are at a mechanical disadvantage

Answer 12

Third class levers

Question 13

Advantage of first class levers

Answer 13

-stable
-strong
-increasing oength of lever arm increases the mechanical advantage

Question 14

Advantage of second class levers

Answer 14

-stable
-strong

Question 15

Advantages of third class levers

Answer 15

-fast movement
-large range of motion

Question 16

Disadvantages of first class levers

Answer 16

-slow
-limited flexibility

Question 17

Disadvantages of second class levers

Answer 17

-slow
-limited flexibility

Question 18

-the force applied must always exceed the load