Levers

Question 1

Axis

Answer 1

An imaginary straight line around which a body or object rotates.

Question 2

Fulcrum

Answer 2

The point which the lever rotates.

Question 3

Load

Answer 3

The force that is applied by the lever system.

Question 4

Effort

Answer 4

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

Question 5

F.L.E

Answer 5

First Class Levers - Fulcrum in the middle.
Second Class Levers - Load in the middle.
Third Class Levers - Effort in the middle.

Question 6

First Class Levers

Answer 6

Left On Top - Effort (Posterior Muscles connected to the neck)
Middle Bottom - Fulcrum (Neck Joint)
Right Top - Load (Head)

Question 7

Second Class Levers

Answer 7

Left Bottom - Fulcrum (Toes)
Middle Top - Load (Body)
Right Top - Effort (Calf Muscles)

Question 8

Third Class Levers

Answer 8

Left Bottom - Fulcrum (Elbow Joint)
Middle Top - Effort (Bicep Muscles)
Right Top - Load (Forearm)

Question 9

Advantages of a First Class Lever System

Answer 9

• Strong
• Stable
• Increasing the length of the lever will increase the mechanical advantage.

Question 10

Advantages of a Second Class Lever System

Answer 10

• Strong
• Stable
• Increasing the length of the lever arm will increase the mechanical advantage.

Question 11

Advantages of a Third Class Lever System

Answer 11

• Large range of motion.
• Movement is fast.
• Increase the length of the lever will decrease the mechanical advantage.

Question 12

Disadvantages of a First Class Lever System

Answer 12

• Slow acting movement.

- Limited flexibility.

Question 13

Disadvantages of a Second Class Lever System

Answer 13

• Slow acting movement.

- Limited flexibility.

Question 14

Disadvantages of a Third Class Lever System

Answer 14

• The amount of force applied must always exceed the weight of the load.