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Simple Machines1

There are six simple machines described in the document: the inclined plane, wedge, screw, lever, wheel and axle, and the three classes of levers. The inclined plane allows you to exert less force over a longer distance to do the same amount of work. Levers use a fulcrum to multiply applied force and can have the fulcrum in different positions to vary the mechanical advantage. The three classes of levers differ in the position of the fulcrum and load. Simple machines make work easier by allowing us to exert less force or change the direction of applied force.

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Simple machines All about simple machines here!!! There are ways of making work easier on you. Let's look at simple machines.
Inclined plane  The Inclined Plane: Often referred to as a 'ramp' the inclined plane allows you to multiply your force over a longer distance.  You do the same amount  In other words, you of work, it just seems easier exert less force but because you spread it over for a longer time. distance.
Wedge  The Wedge: A wedge works in a similar way to the inclined plane, only it is forced into an object to prevent it from moving or to split it into pieces. A knife is a common use of the wedge.
Screw  The Screw: The screw is really just an inclined plane wrapped around a rod. It too can be used to move a load (like a corkscrew) or to 'split' an object (like a carpenter's screw).
Lever  The Lever: The lever is simply a bar supported at a single point called the fulcrum. The positioning of the fulcrum changes the mechanical advantage of the lever. Look at how you can manipulate the position of the fulcrum relative to the heavier weight to lift the 200g mass with only 100g of force...
Wheel and Axle  The Wheel and Axle: Any large disk (the wheel) attached to a small diameter shaft or rod (the axle) can give you mechanical advantage.  Turning a screw with a screwdriver is a simple Can u think of example of a wheel and others we use axle. everyday?
First Class Lever The first class lever is the one you may be most familiar with. It uses a fulcrum in between, and the applied force and load are at opposite ends.
The diagram above shows a first class lever set up to move a heavy load with a small applied force. The force must be applied over a long distance, in order to make the heavy load move just a small amount.  By adjusting how far the fulcrum is from the load, you can control the mechanical advantage. The closer it is to the load, the more force is applied.
Second Class Lever  The second class lever is one where the fulcrum is at one end, and the applied force at the other. The load that is to be moved is between them. This lever is different in how it works ... it causes the load to move in the same direction as the force you apply.
 Just as with a first class lever, how close the load is to the fulcrum determines by how much your force will be multiplied. If you want to move a very large load with a small applied force, you must put the load very close to the fulcrum.
Third Class Lever  The third class lever is the strangest ... and the one you use the most!  The fulcrum is once again at one end of the lever, but this time the load is at the other end, and you apply a force in between. This lever can not give any mechanical advantage.  Regardless of where you apply the force, the force you apply must always be greater than the force of a load.
If you were using this lever to lift an object at a distance, it would require less force to just stand above it and lift it up ... using the lever will require more force!  So why use a third class lever at all? The answer lies in the fact that the load moves in the same direction as the force you apply, which is convenient. So is the application of force between the load and the fulcrum
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