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 do levers function in the body?

Answer 2

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

Question 3

What is a lever?

Answer 3

A lever is a structure that has four components.

Question 4

What is the fulcrum in a lever?

Answer 4

The fulcrum (or pivot) is the point around which the lever rotates.

Question 5

What is the load in a lever system?

Answer 5

The load is the force that is applied by the lever system.

Question 6

What is the effort in a lever system?

Answer 6

The effort is a force that is applied by the user of the lever system.

Question 7

What is the lever arm?

Answer 7

The lever arm is a rigid bar such as a bone.

Question 8

How are levers classified?

Answer 8

Levers are classified according to the placement of the fulcrum, load, and effort.

Question 9

What are the three different classes of levers?

Answer 9

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

Question 10

What does ‘FLE’ stand for in levers?

Answer 10

‘FLE’ helps to remember the order of the levers: Fulcrum, Load, Effort.

Question 11

What is a first class lever?

Answer 11

A first class lever has the fulcrum in the middle.

Question 12

What is a second class lever?

Answer 12

A second class lever has the load in the middle.

Question 13

What is a third class lever?

Answer 13

A third class lever has the effort in the middle.

Question 14

What is an example of a first class lever?

Answer 14

Tricep dip.

The elbow is the fulcrum which sits between the load (bodyweight) and the effort applied by the tricep.

Question 15

What is the role of the elbow in a tricep dip?

Answer 15

The elbow acts as the fulcrum.

Question 16

What are the components of a first class lever in a tricep dip?

Answer 16

The components are the fulcrum (elbow), load (bodyweight), and effort (tricep).

Question 17

What are first class levers?

Answer 17

First class levers are levers where the fulcrum is located between the load and the effort.

Question 18

What is an example of a first class lever?

Answer 18

Nodding your head.

In this example, the neck joint (atlas and axis) is the fulcrum, the load is the head, and the effort is applied by the neck muscle (Sternocleidomastoid).

Question 19

What is the fulcrum in the example of nodding your head?

Answer 19

The neck joint (atlas and axis) is the fulcrum.

Question 20

What is the load in the example of nodding your head?

Answer 20

The load is the head.

Question 21

What is the effort in the example of nodding your head?

Answer 21

The effort is applied by the neck muscle (Sternocleidomastoid).

Question 22

What are second class levers?

Answer 22

Second class levers are levers where the load is positioned between the fulcrum and the effort.

Question 23

Give an example of a second class lever.

Answer 23

An example of a second class lever is the calf raiser.

In this example, the body weight (load) sits between the toes and the ball of the feet (fulcrum), while the gastrocnemius muscles apply the effort by pulling the heel.

Question 24

What is a second class lever?

Answer 24

A lever where the load is positioned between the fulcrum and the effort.

Question 25

Can you provide an example of a second class lever?

Answer 25

Lifting a wheelbarrow.

In this example, the load is the weight on the wheelbarrow, the fulcrum is the wheel, and the effort is applied at the handle.

Question 26

What is a third class lever?

Answer 26

A lever where the effort is applied between the fulcrum and the load.

Question 27

What is an example of a third class lever?

Answer 27

Bicep curl.

The effort is applied by the bicep, which is between the fulcrum at the elbow joint and the weight in your hands (load).

Question 28

What are the components of a third class lever?

Answer 28

Effort, load, and fulcrum.