Levers Simple Machines. Levers are used to help lift heavy objects.

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Presentation transcript:

Levers Simple Machines

Levers are used to help lift heavy objects

What is a lever? Click h`ere to load videoh`ere on YouTube Click here to load videohere on mocomi.com

What is a lever?  Lever: a simple machine that is used to change the direction of force needed to move an object over a fulcrum (pivot point)  The different kinds of levers depend on where the fulcrum is located

 They work by using a strong beam that pivots at a point called the fulcrum fulcrum beam

 The beam spreads the weight of the object across a longer distance  The fulcrum is where the beam pivots, creating leverage, making it easier to lift objects on other side fulcrum beam force load

What are some examples of levers you might see in your daily lives?

 Levers are used when objects are too heavy to pick up by hand  Using a lever allows you to change the direction you apply force to move an object over a pivot point

 Instead of trying to lift an object from the side, a lever will allow you to lift it across a beam  This allows you to lift the object up with more strength because you can get all of your weight behind it!  The longer the beam, the greater the mechanical advantage!

Types of Levers  First Class Lever: the fulcrum is located in between the effort and load  Second Class Lever: the load is located in between the effort and fulcrum  Third Class Lever: the effort is located in between the fulcrum and load

Types of Lever: First Class example

Types of Lever: Second Class example

Types of Lever: Third Class example

Let’s try it!  Use different types of levers to lift different weights!  Write down your observations