Simple Machines Classes of Levers
Presentation
•
Science
•
4th - 5th Grade
•
Hard
Joseph Anderson
FREE Resource
11 Slides • 1 Question
1
Simple Machines
Levers
How Do Levers Work?
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Simple Machines
- Lever
- Wheel and Axel
- Pulley System
- Inclined Plane
- Wedge
- Screw
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Lifting Loads
Lifting a load, which is a weight to be carried and moved, is an example of applying force.
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Mechanical Advantage
Some simple machines create a mechanical advantage to help you use less force to lift a load. A mechanical advantage is when you apply less force to lift a load than you would without the simple machine. >> VIDEO
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Levers
Levers are probably the most common simple machine.
The fulcrum is the point in which a lever rests (pivots);
The load is what you are trying to move;
Effort is the force you apply.
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First Class Levers
The fulcrum is between the effort and the load.
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Second Class Levers
The load is between the effort and the fulcrum.
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Third Class Levers
The effort is between the fulcrum and the load.
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Leavers and Loads
A lever might be able to...
decrease the effort required to move a load;
change the direction that a load moves;
increase the distance that load moves;
Increase the speed with which a load moves.
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How Do Levers Work
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Open Ended
Simple Machines
Levers
How Do Levers Work?
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