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Transcript of Simple Machines
force and direct force
, but they do not create energy. Machines never do more work than the
put into it.
wheel with a
wrapped around it.
Examples are: a
, chain, or
wrapped around a
wheel. Example: zip cord or
Using a pulley, you can change the
for your input force.
Two main types of pulleys:
Pulley - does not change the amount of force you apply to an object
Example: Raising a Flag
pulley - you input force is in the
as the output force.
Example: construction cranes
A sloped surface, a ramp
Allows you to
your input force (the
of force you use) over a longer distance.
of the incline (the less steep), the
input force you must exert
of the incline (the steeper), the
input force you must exert.
A machine is a device that lets people do more
During prehistoric times, man may have used a branch as a
to move huge stones or a sharp rock as a
to skin animal hides. Later man learned to use logs as a roller (
wheel and axle
) to move heavy objects. The roller evolved from a wagon to a modern day car. During the 1700's, the
began in Great Britain, which sparked the use of machines including the
. Steam began to be the source of power in most
. Today we are part of the
because computers run many machines.
History of Machines
inclined planes placed back to
back, used to
Wheel and Axle
objects fastened together that
on the same
. Example: pedals on a bike
inclined plane, the
to a jar
A stiff bar that
on a point called a
. A force exerted on some point on the bar moves
Get out a piece of paper, look around the room and write down any simple machines that you see.
We will discuss as a class in a few minutes.