When a machine is used to do work, two forces are always being used. When you apply a force on a machine, the machine applies a force on an object. For example; suppose you need to lift a car with a jack, when you apply a downword force to the handle of the jack, the jack applies an upward force to the car. The force that is applied to the machine is called the input force, symbolized by Fin. The force that the machine applies to the object is called the output force symbolized by Fout. In the case of our car jack, the input force is the person pushing on the handle and the output force is the jack pushing up on the car.
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Input force: force applied to a machince represented as Fin
Output force: force that a machine applies to an object represented as Fout
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Input and Output Forces:
When a machine is used to do work, two forces are always being used. When you apply a force on a machine, the machine applies a force on an object. For example; suppose you need to lift a car with a jack, when you apply a downword force to the handle of the jack, the jack applies an upward force to the car. The force that is applied to the machine is called the input force, symbolized by Fin. The force that the machine applies to the object is called the output force symbolized by Fout. In the case of our car jack, the input force is the person pushing on the handle and the output force is the jack pushing up on the car.