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Noor Language Schools
Unit 1 Lesson 1 Noor Language Schools Types of Levers
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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.
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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 Noor Language Schools Examples: Manual broom
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3 – Increasing speed: Noor Language Schools 3 – Increasing speed: Hockey bat
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4 – Moving force from one place to another:
Noor Language Schools Exsample: manual broom
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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 Noor Language Schools
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First class levers Noor Language Schools
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second class levers Noor Language Schools
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Third class Levers
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Answer Worksheet 1in the booklet
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