Soc20: Levers

Question 1

Mechanical advantage

Answer 1

a large load can be lifted with a relatively small amount of effort (applies to first and second class levers).

Question 2

Mechanical disadvantage

Answer 2

third class levers cannot lift as heavy a load with the same amount of effort, due to the position of the effort and load from the fulcrum.

Question 3

Axis

Answer 3

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

Question 4

Fulcrum

Answer 4

the point around which the lever rotates.

Question 5

Load

Answer 5

the force that is applied by the lever system.

Question 6

Effort

Answer 6

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

Question 7

First class levers

Answer 7

Fulcrum joint is in the middle between the load and the effort

Question 8

Second class levers

Answer 8

The load is in the middle between the fulcrum and the effort

Question 9

Third class levers

Answer 9

The effort is in the middle between the fulcrum and the load

Question 10

2 Examples of first class lever

Answer 10

Nodding your head with your neck-head=load, neck muscles= effort, fulcrum is between
Tricep dips- weight in hand=load, tricep=effort, fulcrum is elbow between them

Question 11

2 Example of a second class lever

Answer 11

Calf raisers- gastrocnemius=effort, tarsals=fulcrum, load is between them
A wheel barrow- wheel=fulcrum, handle=effort, load is between them

Question 12

2 Examples of third class levers

Answer 12

Bicep curls- load=weight, fulcrum= elbow, effort is bicep between them
Spade- load= weight, fulcrum= handle effort= second hand further down the spade