What is a Fulcrum
A fulcrum, or pivot point, is the area around which a lever turns. A lever is a hard length of material (or a bar) used to put out force or maintain weight at one end, while pressure is exerted on the other end. In other words, when force is placed on one end of a bar or handle, which turns on the fulcrum, for or weight is managed on the second point of the lever. In simple terms the point about which the lever is free to rotate is called fulcrum.
Something that pulls up, it is another word for pivot, it is the support for a lever. Now we can explain this much easily if we consider Scissors as an example or say a child see saw. Scissors actually have two levers that work together. A seesaw with a little kid sitting on one end is an example of a single lever. Since the fulcrum is the rotation point, or the point where the liver is fixed. In case of scissors, it’s the pin or screw that holds the two halves together. For a seesaw, it’s the middle of the board where it’s attached to some kind of shaft. The load is the stuff you’re trying to work on that is located at one end of the lever. For instance, take the scissors, in their case it’s the paper you’re trying to cut. For a seesaw, it’s the little kid sitting by himself on one end. The work you are trying to accomplish is to cut the paper or lift the kid. The effort is the force applied to the free end of the lever to accomplish the work you’re trying to do. For the scissors, it’s the handles you squeeze to cut the paper. For the seesaw, it’s the free end of the lever that you push down to lift the kid on the other end.
The power of using a lever is that placing the fulcrum closer to the load means that less effort can be exerted to move a heavier load. Imagine a crowbar or claw hammer. Both are levers that can be used to extract a nail that we have no chance to remove with our bare hands. The liver further is classified by the relative positions of the fulcrum and the input and output forces. It is common to call the input force the effort and the output force the load or the resistance. This allows the identification of three classes of levers by the relative locations of the fulcrum, the resistance and the effort: Class
1: The effort is applied on one side of the fulcrum and the resistance on the other side, for example, a crowbar or a pair of scissors or a seesaw. Class 2: The effort is applied on one side of the resistance and the fulcrum is located on the other side, for example, a wheelbarrow or a nutcracker. Class 3: The resistance is on one side of the effort and the fulcrum is located on the other side, for example, a pair of tweezers or the human mandible.