Every lever and every class has a fulcrum, load, and effort. It helps move a heavy load.
Class one is when the fulcrum is the main acting force to help carry this weight.
Class two is when the person needs to put more effort to carry a weight.
Class three is when load itself helps carry a weight.
It all depends where the load, effort, and fulcrum are located. If the fulcrum is in the middle, it would be the most supportive force. If the fulcrum was at an edge, the effort or load would be the main forces of carrying, depending on their location. Location is important.
They all work synergistically to carry different things. They all help carry, but the different classes seperate them by fulcrum, effort, and load. Also note that the fulcrum is a very important part of a lever, without it, carrying a big box would be very heavy in the absence of a handler.
FULCRUM is the most important part! Remember that!
