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Unit 1 Lesson 1
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Types of Levers

2. Lever: It is a rigid bar (straight or curved) that rotates around a fixed point called fulcrum, and is affected by an effort force and a resistance force.
The structure of levers:
Any lever consists of:
1 – A resistance force (R): that result from the weight of the body that we want to move.
2 – An effort force (F): that is exerted by a person to equilibrate the resistance.
3 – Fulcrum (O): that is a fixed point, where the bar rotates on.

6. The importance of levers:
1 – Increasing force:
Where some levers save the exerted effort by using a small force to make a great effort as moving a heavy load.
Examples: Crowbar , nutcracker

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2 – Increasing distance
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Examples:
Manual broom

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3 – Increasing speed:
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3 – Increasing speed:
Hockey bat

9. 4 – Moving force from one place to another:
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Exsample:
manual broom

10. 5 – Accuracy in performance:
Example: Tweezers.
6 – Avoid dangers:
Some levers are used to pick up the hot, cold and poisonous materials.
Examples: Coal holder

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Types of Levers
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First class levers
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second class levers
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Third class Levers

17. Answer Worksheet 1in the booklet