What are Input and Output Forces?

Input and Output are two types of forces that are always involved whenever any machine is used to perform work. If were to exert force on the machine of the load you would require someone to exert pressure to the load this would be called Input force and if the machine were to exert force on the load it would be called output force. Both Input and Output are measured in Newtons. Another name for input force is effort force which is symbolized by Force Input (F in) and another name for output force is load force which is symbolized by Force Output (F out).


Three Classes of Levers:

A lever is a rigid bar that is supported at one point. Everyone has used a lever: Riding a teeter tooter, Swinging a hockey stick, Lifting weights etc

Examples of the three classes lever


Using wire cutters is an example of a first class lever

Pushing a wheel barrel is an example of a second class lever

Lifting weights is an example of a third class lever


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Examples of Input and Output

An example for input force is if someone were to put pressure on bicycle pedals while riding a bike.

An example for output force is if you were to push down a carjack it will not be able to push up the car.


Inclined Planes

On the Inclined Plane, the output force is an amount of the force that would be needed to lift the load straight up/how much the object weighs in Newtons. The input force is how much force that is needed for someone or something has to exert on the load to move it up the inclined plane.


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