Watch the following video,...The mechanical advantage = 0.4, which is less than 1, in this case, the...
Transcript of Watch the following video,...The mechanical advantage = 0.4, which is less than 1, in this case, the...
![Page 1: Watch the following video,...The mechanical advantage = 0.4, which is less than 1, in this case, the effort force is more than the load force, because the effort arm length is more](https://reader033.fdocuments.in/reader033/viewer/2022042114/5e907056877ed1389036c94f/html5/thumbnails/1.jpg)
![Page 2: Watch the following video,...The mechanical advantage = 0.4, which is less than 1, in this case, the effort force is more than the load force, because the effort arm length is more](https://reader033.fdocuments.in/reader033/viewer/2022042114/5e907056877ed1389036c94f/html5/thumbnails/2.jpg)
Watch the following video, and answer the
questions
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What is the lever?
![Page 4: Watch the following video,...The mechanical advantage = 0.4, which is less than 1, in this case, the effort force is more than the load force, because the effort arm length is more](https://reader033.fdocuments.in/reader033/viewer/2022042114/5e907056877ed1389036c94f/html5/thumbnails/4.jpg)
How many classes of levers are there?
![Page 5: Watch the following video,...The mechanical advantage = 0.4, which is less than 1, in this case, the effort force is more than the load force, because the effort arm length is more](https://reader033.fdocuments.in/reader033/viewer/2022042114/5e907056877ed1389036c94f/html5/thumbnails/5.jpg)
Module objectives After the completion of this module, you will be able to
• Identify levers.
• Calculate the mechanical advantage of a lever.
• Calculate forces and lengths related to levers
• Distinguish and explain the differences between the three classes of levers
• Give real examples of the different types of levers
![Page 6: Watch the following video,...The mechanical advantage = 0.4, which is less than 1, in this case, the effort force is more than the load force, because the effort arm length is more](https://reader033.fdocuments.in/reader033/viewer/2022042114/5e907056877ed1389036c94f/html5/thumbnails/6.jpg)
Introduction to levers
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Introduction to levers
In The previous module you have studied the different types of simple machines, lever is one of the most commonly used simple machines.
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But, What is a lever?
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Definition of lever
A lever is a rigid bar that is used to transfer force.
With a pivot or sometimes called fulcrum, the lever can be used to change force that is applied (effort) by changing the position of the pivot along the lever..
![Page 10: Watch the following video,...The mechanical advantage = 0.4, which is less than 1, in this case, the effort force is more than the load force, because the effort arm length is more](https://reader033.fdocuments.in/reader033/viewer/2022042114/5e907056877ed1389036c94f/html5/thumbnails/10.jpg)
Feature of leversEFFORT, PIVOT (fulcrum), and LOAD are the three features that are common in every levers.
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• Pivot: is the point on which the lever balances (or fulcrum)
• Load is the weight or resistance that needs to be overcome.
• Effort is the force you apply to the lever.
Feature of levers
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Of Levers
![Page 13: Watch the following video,...The mechanical advantage = 0.4, which is less than 1, in this case, the effort force is more than the load force, because the effort arm length is more](https://reader033.fdocuments.in/reader033/viewer/2022042114/5e907056877ed1389036c94f/html5/thumbnails/13.jpg)
What is the Mechanical advantage
![Page 14: Watch the following video,...The mechanical advantage = 0.4, which is less than 1, in this case, the effort force is more than the load force, because the effort arm length is more](https://reader033.fdocuments.in/reader033/viewer/2022042114/5e907056877ed1389036c94f/html5/thumbnails/14.jpg)
![Page 15: Watch the following video,...The mechanical advantage = 0.4, which is less than 1, in this case, the effort force is more than the load force, because the effort arm length is more](https://reader033.fdocuments.in/reader033/viewer/2022042114/5e907056877ed1389036c94f/html5/thumbnails/15.jpg)
Mechanical advantage
The mechanical advantage of a machine is the ratio of the output force produced by a machine to the applied input force.
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Mechanical advantage of lever
In levers, the ideal mechanical advantage (MAi) of a lever is the ratio of the length of the effort arm (LE) to the length of the load arm (LL).
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Mechanical advantage of lever
It can be calculated using the following formula:
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The amount of effort in leversThe amount of effort needed to lift a given load with any lever can be calculated using the formula:
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Page4
Example 1
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Example 1
Refer to the figure, calculate the following :
1. The effort needed to balance the 400 N, given that the load arm length is 2m .
2. The ideal mechanical advantage.
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Example 1 solution1. The effort is calculated as follows
FE x LE = FL x LL
FE x 2m = 400 N x 0.4 m
FE = 400 N x 0.4 m / 2 m
FE = 80 N
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Example 1 solution1. The mechanical advantage is calculated as follows :
MAi= LE / LL
MAi = 2 m / 0.4 m
= 5
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Example 3 :
• Find the amount of load
• Calculate the mechanical advantage
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Note that
![Page 25: Watch the following video,...The mechanical advantage = 0.4, which is less than 1, in this case, the effort force is more than the load force, because the effort arm length is more](https://reader033.fdocuments.in/reader033/viewer/2022042114/5e907056877ed1389036c94f/html5/thumbnails/25.jpg)
Now Try to solve this
example
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Example 2:
• Find the amount of effort
• Calculate the mechanical advantage
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Example 2 solution1. The effort is calculated as follows
FE x LE = FL x LL
FE x 2.5m = 250 N x 1m
FE = 250 N x 1m / 2.5 m
FE = 100 N
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Example 2 solution1. The mechanical advantage is calculated as follows :
MAi= LE / LL
MAi = 2.5 m / 1m
=2.5
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Note that
The mechanical advantage = 2.5 , this means that the Amount of effort (FE) is less than the amount of load (FL) by 2.5 times, and the effort arm length (LE) is greater than the load arm length(LL) by 2.5 times
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Example 3 solution1. The effort is calculated as follows
FE x LE = FL x LL
800 x 4 m= FL x 2 m
FL = 800 N x 4m / 2 m
FL = 1600 N
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Example 3 solution1. The mechanical advantage is calculated as follows :
MAi= LE / LL
MAi = 4 m / 2 m
= 2
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Note that
The mechanical advantage = 2 , this means that the Amount of effort (FE) is less than the amount of load (FL) by 2 times, and the effort arm length (LE) is greater than the load arm length(LL) by 2 times
![Page 33: Watch the following video,...The mechanical advantage = 0.4, which is less than 1, in this case, the effort force is more than the load force, because the effort arm length is more](https://reader033.fdocuments.in/reader033/viewer/2022042114/5e907056877ed1389036c94f/html5/thumbnails/33.jpg)
Example 4 :
• Find the amount of effort
• Calculate the mechanical advantage
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Example 4 solution1. The effort is calculated as follows
FE x LE = FL x LL
FE x 2 m= 500 x 5 m
FL = 500 N x 5m / 2 m
FL = 1250 N
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Example 4 solution1. The mechanical advantage is calculated as follows :
MAi= LE / LL
MAi = 2 m / 5 m
=0.4
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Note that
The mechanical advantage = 0.4, which is less than 1, in this case, the effort force is more than the load force, because the effort arm length is more than the load arm length.
![Page 37: Watch the following video,...The mechanical advantage = 0.4, which is less than 1, in this case, the effort force is more than the load force, because the effort arm length is more](https://reader033.fdocuments.in/reader033/viewer/2022042114/5e907056877ed1389036c94f/html5/thumbnails/37.jpg)
Example 5 :
• Find the amount of effort
• Calculate the mechanical advantage
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Example 5 solution1. The effort is calculated as follows
FE x LE = FL x LL
FE x 7 m= 350 x 2.5 m
FL = 350 N x 2.5m / 7 m
FL = 125 N
![Page 39: Watch the following video,...The mechanical advantage = 0.4, which is less than 1, in this case, the effort force is more than the load force, because the effort arm length is more](https://reader033.fdocuments.in/reader033/viewer/2022042114/5e907056877ed1389036c94f/html5/thumbnails/39.jpg)
Example 5 solution1. The mechanical advantage is calculated as follows :
MAi= LE / LL
MAi = 7 m / 2.5 m
=2.8
![Page 40: Watch the following video,...The mechanical advantage = 0.4, which is less than 1, in this case, the effort force is more than the load force, because the effort arm length is more](https://reader033.fdocuments.in/reader033/viewer/2022042114/5e907056877ed1389036c94f/html5/thumbnails/40.jpg)
Note that
The mechanical advantage = 2.8 , this means that the Amount of effort (FE) is less than the amount of load (FL) by 2.8 times, and the effort arm length (LE) is greater than the load arm length(LL) by 2.8 times
![Page 41: Watch the following video,...The mechanical advantage = 0.4, which is less than 1, in this case, the effort force is more than the load force, because the effort arm length is more](https://reader033.fdocuments.in/reader033/viewer/2022042114/5e907056877ed1389036c94f/html5/thumbnails/41.jpg)
Example 6
!
• Calculate the ideal mechanical advantage
Effort =50 NLoad =300 N
LE =??LL =1
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Example 6 solution1. The effort is calculated as follows
FE x LE = FL x LL
50 x LE = 300 x 1 m
LE = 300 N x 1m / 50 N
LE = 6 m
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Example 6 solution1. The mechanical advantage is calculated as follows :
MAi= LE / LL
MAi = 6 m / 1 m
=6
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Note that
The mechanical advantage = 6 , this means that the Amount of effort (FE) is less than the amount of load (FL) by 6 times, and the effort arm length (LE) is greater than the load arm length(LL) by 6 times
![Page 45: Watch the following video,...The mechanical advantage = 0.4, which is less than 1, in this case, the effort force is more than the load force, because the effort arm length is more](https://reader033.fdocuments.in/reader033/viewer/2022042114/5e907056877ed1389036c94f/html5/thumbnails/45.jpg)
Try to solve the question page 6
![Page 46: Watch the following video,...The mechanical advantage = 0.4, which is less than 1, in this case, the effort force is more than the load force, because the effort arm length is more](https://reader033.fdocuments.in/reader033/viewer/2022042114/5e907056877ed1389036c94f/html5/thumbnails/46.jpg)
Quick class activityMaitha was given the task of moving a table of 600 N, where the load arm length is 5 m and the effort arm length is 10 m.
• Calculate the effort needed
• Calculate the ideal mechanical advantage.
![Page 47: Watch the following video,...The mechanical advantage = 0.4, which is less than 1, in this case, the effort force is more than the load force, because the effort arm length is more](https://reader033.fdocuments.in/reader033/viewer/2022042114/5e907056877ed1389036c94f/html5/thumbnails/47.jpg)
Answer to question 1. The effort is calculated as follows
FE x LE = FL x LL
FE x 10 m = 600 x 5 m
FE = 600 N x 5m / 10 N
FE = 300 N
![Page 48: Watch the following video,...The mechanical advantage = 0.4, which is less than 1, in this case, the effort force is more than the load force, because the effort arm length is more](https://reader033.fdocuments.in/reader033/viewer/2022042114/5e907056877ed1389036c94f/html5/thumbnails/48.jpg)
1. The mechanical advantage is calculated as follows :
MAi= LE / LL
MAi = 10 m / 5 m
=2
Answer to question
![Page 49: Watch the following video,...The mechanical advantage = 0.4, which is less than 1, in this case, the effort force is more than the load force, because the effort arm length is more](https://reader033.fdocuments.in/reader033/viewer/2022042114/5e907056877ed1389036c94f/html5/thumbnails/49.jpg)
Note that
The mechanical advantage = 2 , this means that the Amount of effort (FE) is less than the amount of load (FL) by 2 times, and the effort arm length (LE) is greater than the load arm length(LL) by 2 times
![Page 50: Watch the following video,...The mechanical advantage = 0.4, which is less than 1, in this case, the effort force is more than the load force, because the effort arm length is more](https://reader033.fdocuments.in/reader033/viewer/2022042114/5e907056877ed1389036c94f/html5/thumbnails/50.jpg)
Don't forget to solve your homework It's posted on my weebly
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![Page 51: Watch the following video,...The mechanical advantage = 0.4, which is less than 1, in this case, the effort force is more than the load force, because the effort arm length is more](https://reader033.fdocuments.in/reader033/viewer/2022042114/5e907056877ed1389036c94f/html5/thumbnails/51.jpg)
Classes of levers
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Watch the following video
![Page 53: Watch the following video,...The mechanical advantage = 0.4, which is less than 1, in this case, the effort force is more than the load force, because the effort arm length is more](https://reader033.fdocuments.in/reader033/viewer/2022042114/5e907056877ed1389036c94f/html5/thumbnails/53.jpg)
What are the main feature of levers?
![Page 54: Watch the following video,...The mechanical advantage = 0.4, which is less than 1, in this case, the effort force is more than the load force, because the effort arm length is more](https://reader033.fdocuments.in/reader033/viewer/2022042114/5e907056877ed1389036c94f/html5/thumbnails/54.jpg)
How many classes of levers are there?
![Page 55: Watch the following video,...The mechanical advantage = 0.4, which is less than 1, in this case, the effort force is more than the load force, because the effort arm length is more](https://reader033.fdocuments.in/reader033/viewer/2022042114/5e907056877ed1389036c94f/html5/thumbnails/55.jpg)
Classes of levers
There are three classes of levers:
• First class
• Second class
• Third class
![Page 56: Watch the following video,...The mechanical advantage = 0.4, which is less than 1, in this case, the effort force is more than the load force, because the effort arm length is more](https://reader033.fdocuments.in/reader033/viewer/2022042114/5e907056877ed1389036c94f/html5/thumbnails/56.jpg)
First class lever
![Page 57: Watch the following video,...The mechanical advantage = 0.4, which is less than 1, in this case, the effort force is more than the load force, because the effort arm length is more](https://reader033.fdocuments.in/reader033/viewer/2022042114/5e907056877ed1389036c94f/html5/thumbnails/57.jpg)
First class leverFirst class lever have the fulcrum (pivot) positioned between the effort and the load.
![Page 58: Watch the following video,...The mechanical advantage = 0.4, which is less than 1, in this case, the effort force is more than the load force, because the effort arm length is more](https://reader033.fdocuments.in/reader033/viewer/2022042114/5e907056877ed1389036c94f/html5/thumbnails/58.jpg)
See-saw game is an example of a first class lever.
![Page 59: Watch the following video,...The mechanical advantage = 0.4, which is less than 1, in this case, the effort force is more than the load force, because the effort arm length is more](https://reader033.fdocuments.in/reader033/viewer/2022042114/5e907056877ed1389036c94f/html5/thumbnails/59.jpg)
Can you think of another example??
![Page 60: Watch the following video,...The mechanical advantage = 0.4, which is less than 1, in this case, the effort force is more than the load force, because the effort arm length is more](https://reader033.fdocuments.in/reader033/viewer/2022042114/5e907056877ed1389036c94f/html5/thumbnails/60.jpg)
Second class lever
![Page 61: Watch the following video,...The mechanical advantage = 0.4, which is less than 1, in this case, the effort force is more than the load force, because the effort arm length is more](https://reader033.fdocuments.in/reader033/viewer/2022042114/5e907056877ed1389036c94f/html5/thumbnails/61.jpg)
Second class leverIn the second class lever, the load is positioned between the fulcrum (pivot) and the effort.
![Page 62: Watch the following video,...The mechanical advantage = 0.4, which is less than 1, in this case, the effort force is more than the load force, because the effort arm length is more](https://reader033.fdocuments.in/reader033/viewer/2022042114/5e907056877ed1389036c94f/html5/thumbnails/62.jpg)
Nut cracker is a second class lever.
![Page 63: Watch the following video,...The mechanical advantage = 0.4, which is less than 1, in this case, the effort force is more than the load force, because the effort arm length is more](https://reader033.fdocuments.in/reader033/viewer/2022042114/5e907056877ed1389036c94f/html5/thumbnails/63.jpg)
Third class lever
![Page 64: Watch the following video,...The mechanical advantage = 0.4, which is less than 1, in this case, the effort force is more than the load force, because the effort arm length is more](https://reader033.fdocuments.in/reader033/viewer/2022042114/5e907056877ed1389036c94f/html5/thumbnails/64.jpg)
Third class leverThird class levers have the effort positioned in the middle between the load and pivot
![Page 65: Watch the following video,...The mechanical advantage = 0.4, which is less than 1, in this case, the effort force is more than the load force, because the effort arm length is more](https://reader033.fdocuments.in/reader033/viewer/2022042114/5e907056877ed1389036c94f/html5/thumbnails/65.jpg)
Tweezers are typical example of third class levers.
![Page 66: Watch the following video,...The mechanical advantage = 0.4, which is less than 1, in this case, the effort force is more than the load force, because the effort arm length is more](https://reader033.fdocuments.in/reader033/viewer/2022042114/5e907056877ed1389036c94f/html5/thumbnails/66.jpg)
The following pictures are examples of third class levers.
![Page 67: Watch the following video,...The mechanical advantage = 0.4, which is less than 1, in this case, the effort force is more than the load force, because the effort arm length is more](https://reader033.fdocuments.in/reader033/viewer/2022042114/5e907056877ed1389036c94f/html5/thumbnails/67.jpg)
![Page 68: Watch the following video,...The mechanical advantage = 0.4, which is less than 1, in this case, the effort force is more than the load force, because the effort arm length is more](https://reader033.fdocuments.in/reader033/viewer/2022042114/5e907056877ed1389036c94f/html5/thumbnails/68.jpg)
Class activityWatch the hammer video and determine which class of lever it is.
Identify the pivot, the load, And the effort.
![Page 69: Watch the following video,...The mechanical advantage = 0.4, which is less than 1, in this case, the effort force is more than the load force, because the effort arm length is more](https://reader033.fdocuments.in/reader033/viewer/2022042114/5e907056877ed1389036c94f/html5/thumbnails/69.jpg)
First class lever
PivotLoad
Effort
![Page 70: Watch the following video,...The mechanical advantage = 0.4, which is less than 1, in this case, the effort force is more than the load force, because the effort arm length is more](https://reader033.fdocuments.in/reader033/viewer/2022042114/5e907056877ed1389036c94f/html5/thumbnails/70.jpg)
Class activityWatch the can crusher video, and determine which class of lever it is.
Identify the pivot, the load, And the effort.
![Page 71: Watch the following video,...The mechanical advantage = 0.4, which is less than 1, in this case, the effort force is more than the load force, because the effort arm length is more](https://reader033.fdocuments.in/reader033/viewer/2022042114/5e907056877ed1389036c94f/html5/thumbnails/71.jpg)
Second class lever
Pivot
Load
Effort
![Page 72: Watch the following video,...The mechanical advantage = 0.4, which is less than 1, in this case, the effort force is more than the load force, because the effort arm length is more](https://reader033.fdocuments.in/reader033/viewer/2022042114/5e907056877ed1389036c94f/html5/thumbnails/72.jpg)
Class activityRefer to the scissors image shown, and determine which class of lever it is.
Identify the pivot, the load, And the effort.
![Page 73: Watch the following video,...The mechanical advantage = 0.4, which is less than 1, in this case, the effort force is more than the load force, because the effort arm length is more](https://reader033.fdocuments.in/reader033/viewer/2022042114/5e907056877ed1389036c94f/html5/thumbnails/73.jpg)
First class lever
PivotLoad
Effort
![Page 74: Watch the following video,...The mechanical advantage = 0.4, which is less than 1, in this case, the effort force is more than the load force, because the effort arm length is more](https://reader033.fdocuments.in/reader033/viewer/2022042114/5e907056877ed1389036c94f/html5/thumbnails/74.jpg)
Class activityRefer to the wheel barrow image shown, and determine which class of lever it is.
Identify the pivot, the load, And the effort.
![Page 75: Watch the following video,...The mechanical advantage = 0.4, which is less than 1, in this case, the effort force is more than the load force, because the effort arm length is more](https://reader033.fdocuments.in/reader033/viewer/2022042114/5e907056877ed1389036c94f/html5/thumbnails/75.jpg)
Second class leverPivot
Load
Effort
![Page 76: Watch the following video,...The mechanical advantage = 0.4, which is less than 1, in this case, the effort force is more than the load force, because the effort arm length is more](https://reader033.fdocuments.in/reader033/viewer/2022042114/5e907056877ed1389036c94f/html5/thumbnails/76.jpg)
Class activityRefer to the fishing rod image shown, and determine which class of lever it is.
Identify the pivot, the load, And the effort.
![Page 77: Watch the following video,...The mechanical advantage = 0.4, which is less than 1, in this case, the effort force is more than the load force, because the effort arm length is more](https://reader033.fdocuments.in/reader033/viewer/2022042114/5e907056877ed1389036c94f/html5/thumbnails/77.jpg)
Third class lever
Pivot
Load
Effort
![Page 78: Watch the following video,...The mechanical advantage = 0.4, which is less than 1, in this case, the effort force is more than the load force, because the effort arm length is more](https://reader033.fdocuments.in/reader033/viewer/2022042114/5e907056877ed1389036c94f/html5/thumbnails/78.jpg)
Class activityRefer to the shovel image shown, and determine which class of lever it is.
Identify the pivot, the load, And the effort.
![Page 79: Watch the following video,...The mechanical advantage = 0.4, which is less than 1, in this case, the effort force is more than the load force, because the effort arm length is more](https://reader033.fdocuments.in/reader033/viewer/2022042114/5e907056877ed1389036c94f/html5/thumbnails/79.jpg)
Third class lever
Pivot Load
Effort
![Page 80: Watch the following video,...The mechanical advantage = 0.4, which is less than 1, in this case, the effort force is more than the load force, because the effort arm length is more](https://reader033.fdocuments.in/reader033/viewer/2022042114/5e907056877ed1389036c94f/html5/thumbnails/80.jpg)
![Page 81: Watch the following video,...The mechanical advantage = 0.4, which is less than 1, in this case, the effort force is more than the load force, because the effort arm length is more](https://reader033.fdocuments.in/reader033/viewer/2022042114/5e907056877ed1389036c94f/html5/thumbnails/81.jpg)
![Page 82: Watch the following video,...The mechanical advantage = 0.4, which is less than 1, in this case, the effort force is more than the load force, because the effort arm length is more](https://reader033.fdocuments.in/reader033/viewer/2022042114/5e907056877ed1389036c94f/html5/thumbnails/82.jpg)
At these examples and decide what class of lever there is
![Page 83: Watch the following video,...The mechanical advantage = 0.4, which is less than 1, in this case, the effort force is more than the load force, because the effort arm length is more](https://reader033.fdocuments.in/reader033/viewer/2022042114/5e907056877ed1389036c94f/html5/thumbnails/83.jpg)
![Page 84: Watch the following video,...The mechanical advantage = 0.4, which is less than 1, in this case, the effort force is more than the load force, because the effort arm length is more](https://reader033.fdocuments.in/reader033/viewer/2022042114/5e907056877ed1389036c94f/html5/thumbnails/84.jpg)
![Page 85: Watch the following video,...The mechanical advantage = 0.4, which is less than 1, in this case, the effort force is more than the load force, because the effort arm length is more](https://reader033.fdocuments.in/reader033/viewer/2022042114/5e907056877ed1389036c94f/html5/thumbnails/85.jpg)
![Page 86: Watch the following video,...The mechanical advantage = 0.4, which is less than 1, in this case, the effort force is more than the load force, because the effort arm length is more](https://reader033.fdocuments.in/reader033/viewer/2022042114/5e907056877ed1389036c94f/html5/thumbnails/86.jpg)
![Page 87: Watch the following video,...The mechanical advantage = 0.4, which is less than 1, in this case, the effort force is more than the load force, because the effort arm length is more](https://reader033.fdocuments.in/reader033/viewer/2022042114/5e907056877ed1389036c94f/html5/thumbnails/87.jpg)
![Page 88: Watch the following video,...The mechanical advantage = 0.4, which is less than 1, in this case, the effort force is more than the load force, because the effort arm length is more](https://reader033.fdocuments.in/reader033/viewer/2022042114/5e907056877ed1389036c94f/html5/thumbnails/88.jpg)
![Page 89: Watch the following video,...The mechanical advantage = 0.4, which is less than 1, in this case, the effort force is more than the load force, because the effort arm length is more](https://reader033.fdocuments.in/reader033/viewer/2022042114/5e907056877ed1389036c94f/html5/thumbnails/89.jpg)
![Page 90: Watch the following video,...The mechanical advantage = 0.4, which is less than 1, in this case, the effort force is more than the load force, because the effort arm length is more](https://reader033.fdocuments.in/reader033/viewer/2022042114/5e907056877ed1389036c94f/html5/thumbnails/90.jpg)
![Page 91: Watch the following video,...The mechanical advantage = 0.4, which is less than 1, in this case, the effort force is more than the load force, because the effort arm length is more](https://reader033.fdocuments.in/reader033/viewer/2022042114/5e907056877ed1389036c94f/html5/thumbnails/91.jpg)
![Page 92: Watch the following video,...The mechanical advantage = 0.4, which is less than 1, in this case, the effort force is more than the load force, because the effort arm length is more](https://reader033.fdocuments.in/reader033/viewer/2022042114/5e907056877ed1389036c94f/html5/thumbnails/92.jpg)
![Page 93: Watch the following video,...The mechanical advantage = 0.4, which is less than 1, in this case, the effort force is more than the load force, because the effort arm length is more](https://reader033.fdocuments.in/reader033/viewer/2022042114/5e907056877ed1389036c94f/html5/thumbnails/93.jpg)
Study the given tools given to you by the teacher,
• Identify the effort, pivot, and fulcrum
• decide which class of levers there?
class activity 2:
![Page 94: Watch the following video,...The mechanical advantage = 0.4, which is less than 1, in this case, the effort force is more than the load force, because the effort arm length is more](https://reader033.fdocuments.in/reader033/viewer/2022042114/5e907056877ed1389036c94f/html5/thumbnails/94.jpg)
Did you know?
![Page 95: Watch the following video,...The mechanical advantage = 0.4, which is less than 1, in this case, the effort force is more than the load force, because the effort arm length is more](https://reader033.fdocuments.in/reader033/viewer/2022042114/5e907056877ed1389036c94f/html5/thumbnails/95.jpg)
Human body contains different classes of levers.
Can you give an example?
Did you know that?
![Page 96: Watch the following video,...The mechanical advantage = 0.4, which is less than 1, in this case, the effort force is more than the load force, because the effort arm length is more](https://reader033.fdocuments.in/reader033/viewer/2022042114/5e907056877ed1389036c94f/html5/thumbnails/96.jpg)
![Page 97: Watch the following video,...The mechanical advantage = 0.4, which is less than 1, in this case, the effort force is more than the load force, because the effort arm length is more](https://reader033.fdocuments.in/reader033/viewer/2022042114/5e907056877ed1389036c94f/html5/thumbnails/97.jpg)
Practical tasks
![Page 98: Watch the following video,...The mechanical advantage = 0.4, which is less than 1, in this case, the effort force is more than the load force, because the effort arm length is more](https://reader033.fdocuments.in/reader033/viewer/2022042114/5e907056877ed1389036c94f/html5/thumbnails/98.jpg)
Task 1• Determine which class of lever is this?
• Identify the pivot, the load, and the effort.
• Calculate the mechanical advantage.
![Page 99: Watch the following video,...The mechanical advantage = 0.4, which is less than 1, in this case, the effort force is more than the load force, because the effort arm length is more](https://reader033.fdocuments.in/reader033/viewer/2022042114/5e907056877ed1389036c94f/html5/thumbnails/99.jpg)
EffortLoad
Pivot
First class
![Page 100: Watch the following video,...The mechanical advantage = 0.4, which is less than 1, in this case, the effort force is more than the load force, because the effort arm length is more](https://reader033.fdocuments.in/reader033/viewer/2022042114/5e907056877ed1389036c94f/html5/thumbnails/100.jpg)
![Page 101: Watch the following video,...The mechanical advantage = 0.4, which is less than 1, in this case, the effort force is more than the load force, because the effort arm length is more](https://reader033.fdocuments.in/reader033/viewer/2022042114/5e907056877ed1389036c94f/html5/thumbnails/101.jpg)
Task 2• Determine which class of lever is this?
• Identify the pivot, the load, and the effort.
• Calculate the mechanical advantage.
![Page 102: Watch the following video,...The mechanical advantage = 0.4, which is less than 1, in this case, the effort force is more than the load force, because the effort arm length is more](https://reader033.fdocuments.in/reader033/viewer/2022042114/5e907056877ed1389036c94f/html5/thumbnails/102.jpg)
Effort
Load Pivot
Second class
![Page 103: Watch the following video,...The mechanical advantage = 0.4, which is less than 1, in this case, the effort force is more than the load force, because the effort arm length is more](https://reader033.fdocuments.in/reader033/viewer/2022042114/5e907056877ed1389036c94f/html5/thumbnails/103.jpg)
![Page 104: Watch the following video,...The mechanical advantage = 0.4, which is less than 1, in this case, the effort force is more than the load force, because the effort arm length is more](https://reader033.fdocuments.in/reader033/viewer/2022042114/5e907056877ed1389036c94f/html5/thumbnails/104.jpg)
Task 3• Determine which class of lever is this?
• Identify the pivot, the load, and the effort.
• Calculate the mechanical advantage.
![Page 105: Watch the following video,...The mechanical advantage = 0.4, which is less than 1, in this case, the effort force is more than the load force, because the effort arm length is more](https://reader033.fdocuments.in/reader033/viewer/2022042114/5e907056877ed1389036c94f/html5/thumbnails/105.jpg)
EffortLoad
Pivot
Third class
![Page 106: Watch the following video,...The mechanical advantage = 0.4, which is less than 1, in this case, the effort force is more than the load force, because the effort arm length is more](https://reader033.fdocuments.in/reader033/viewer/2022042114/5e907056877ed1389036c94f/html5/thumbnails/106.jpg)
![Page 107: Watch the following video,...The mechanical advantage = 0.4, which is less than 1, in this case, the effort force is more than the load force, because the effort arm length is more](https://reader033.fdocuments.in/reader033/viewer/2022042114/5e907056877ed1389036c94f/html5/thumbnails/107.jpg)
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