Where is the effort and the load and the fulcrum on a ladder?

Principally, a lever is a board, with some kind of object on one side that you want to move up, this it the load. and the effort is the force you exert either, down on the other side of the fulcrum, or up on the same side. there are three classes of levers, class 1 class 2 and class 3

class one, look at a seesaw, the fulcrum is the part holding it up in the middle, this is it's central balanceing point, weight of one person on one side will push down and make the other side go up, but if there are two people, the one that weighs more will go down because he has the most weight pressing down on his side.

class 2, imagine having the same seesaw, but noibody on it, now sombody stands on one side, and then walks closer to the fulcrum and stays there, if you hold the far end and puch up, you are exerting force on the same side of the fulcrum, but your pushing him up. if you can move the fulcrum farther away from the person your pushing up, it will take less effort to push him just as high.

class three, the seesaw has nobody on it, your friend steps onto one side of the farthest point, and you start pushing up from the same side of the fulcrum, but the different side of him, it's a class 2, but you are closer to the fulcrum then the weight, this is a class three.

examples:

class 1: seesaw (the way kids play on them)

class 2: I can't think of a good example.

class 3: catapult >.<