This sprang from the stem of the verb lever, meaning "to raise". ... is in the middle for the 2nd class lever, and the e ffort is in the middle for the 3rd class lever.
Lever. What is it? A lever is a simple machine that is made up of a board or bar
that rests ... In a
The difference between first,
Jul 30, 2014
diagram of the three types of
Like the First Class Lever, the