LEVERS
Levers are simple machines that consist of a lever arm which moves along a fulcrum. A lever is classified by the positions of its fulcrum, input force, and output force relative to one another. The amount of force applied to lever multiplied by its distance from the fulcrum is the torque. The input torque on a lever will always be the same as the output torque. You can calculate the mechanical advantage of a lever either by dividing the the distance between the input force and the fulcrum by the distance between the output force and the fulcrum or by dividing the output force by the input force.