A lever is a simple machine that makes work easier; it involves moving a load around a pivot using a force. In a lever there is a load, a pivot and an Effort (force). Levers are amongst the oldest forms of mechanical system.
The input of this system is called the effort and the output is called the load. In the image, we have the input as F1 and the output as F2. The bar pivots on a fixed point (fulcrum).
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