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Unit 4: Energy (Part 1) Page 11
Sure enough after several days, Highlights for Simple
Archimedes created a system of Machines
levers and pulleys that allowed him
to move the boat by himself...with
one hand. Most folks say there are six simple
machines. They are the inclined
plane, the wheel and axle, the
According to one version of the
story, the king did not believe that lever, the pulley, the wedge, and
Archimedes was doing it on his the screw.
own and that there must be some
trick. Archimedes said, “Okay, you All machines with moving parts are
made up of simple machines.
do it.” The king hesitantly gave it a
try and sure enough, in front of a
A machine is any device that
huge crowd, the king moved the
ship. At that point, the king transmits or modifies energy.
shouted out, “From this day forth,
Simple machines are often used to
Archimedes is to be believed in
reduce the amount of force it takes
everything that he may say”.
to move something.
Archimedes was an unbelievable
scientist and mathematician. There Work in equals work out. Although
as you’ll see later, work out is
are many terrific stories
always less due some work being
surrounding his life and
discoveries. I would highly lost to heat and sound.
recommend taking the time to look Simple machines usually sacrifice
into him a bit further.
distance for force. The amount the
effort moves is much more then
The Lever
the amount the load moves.
However, the force the effort needs
So what is this lever thing anyway? to push with to move the load is
Well, at it’s most basic level, it’s a much less.
stick and a rock...pretty simple
machine huh? The lever is made up Levers have three different parts.
of two parts, the lever (the stick The lever, the load and the effort.
part) and the fulcrum (the rock
part). Believe it or not, using this There are three different kinds of
very simple machine you can lift levers.
hundreds of pounds with your bare
hands and very little effort. A first-class lever is a lever in
which the fulcrum is located in
between the effort and the load.
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