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Levers For Mrs. Berg’s Science Class
A lever consists of a rod or bar that rests and turns on a support called a  fulcrum . effort resistance
  A  force of effort  is applied at one end of the rod to lift a load placed at the other end. A lever can help lift a weight with less effort.  effort resistance fulcrum
Prying something loose with a crowbar is using a lever. Some machines, such as a catapult, use a lever to hurl objects.
Here is a catapult you could make.
Three Classes of Levers ,[object Object],[object Object],resistance fulcrum effort
Three Classes of Levers ,[object Object],[object Object]
Three Classes of Levers ,[object Object],[object Object]
First Class Lever Second Class Lever Third Class Lever
 
 
Levers on the internet ,[object Object],[object Object],[object Object],[object Object],[object Object]
Levers in the Body ,[object Object]
An example in the human body of a  second-class lever  is the  Achilles tendon , pushing or pulling across the heel of the foot.
An example of a  third-class  lever in the human body is the  elbow joint : when lifting a book, the elbow joint is the fulcrum across which the biceps muscle performs the work.
First Class Lever Second Class Lever Third Class Lever
 
 
Key Concepts: ,[object Object],[object Object]
Key Concepts: ,[object Object],[object Object],[object Object],[object Object]
Vocabulary ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
beam bar rod board
rotate Turn
effort Resistance / Load fulcrum
work
friction
Mechanical Advantage

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Levers