Soc 20

Question 1

Levers

Answer 1

Muscles pull on your bones and your bones create movement

Question 2

Fulcrum ( joint )

Answer 2

The point around which the lever rotates

Question 3

Load ( weight )

Answer 3

The force that is applied by the lever system

Question 4

Effort ( muscle )

Answer 4

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

Question 5

Axis

Answer 5

An imaginary straight line around which a body or object rotates

Question 6

First class

Answer 6

Advantages:
Stable
Strong
Increasing the length of the lever arm increases the mechanical advantage

Disadvantage:
Slow
Limited flexibility

Question 7

Second class

Answer 7

Advantage:
Stable
Strong
Increasing the length of the lever arm increases the mechanical advantage

Disadvantage:
Slow
Limited flexibility

Question 8

Third class

Answer 8

Advantages:
Fast movement
Large range of motion
Increasing the length of the lever arm decreases the mechanical advantage

Disadvantage:
The force applied must always exced the load