lever
there are three classes of levers 1st class, 2nd class and 3rd class lever.
a first class lever is a lever that the fulcrum is in the middle and the load and the effort is at the end.
the third class lever is set up by putting the load and fulcrum are at the two ends and the effort is in the middle.
the seconed class lever is a simple machine where the load is in the middle and the fulcrum and effort is on the end.
Enter supporting content here
