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Simple Machines

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by

Sherene Mayner

on 27 January 2014

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Transcript of Simple Machines

Machines that produce
force and direct force
, but they do not create energy. Machines never do more work than the
energy
put into it.
Simple Machines
Watch this...
Machines
Screw
A
grooved
wheel with a
rope
wrapped around it.
Examples are: a
rope
, chain, or
belt
wrapped around a
grooved
wheel. Example: zip cord or
flagpole
Using a pulley, you can change the
amount
of and
direction
for your input force.
Two main types of pulleys:
Fixed
Pulley - does not change the amount of force you apply to an object
Example: Raising a Flag
Movable
pulley - you input force is in the
same direction
as the output force.
Example: construction cranes
Pulley
Inclined Plane
A sloped surface, a ramp
Allows you to
exert
your input force (the
amount
of force you use) over a longer distance.
The
longer
the
length
of the incline (the less steep), the
less
input force you must exert
The
shorter
the
length
of the incline (the steeper), the
more
input force you must exert.
A machine is a device that lets people do more
work
in less
time
.
Simple Machines
During prehistoric times, man may have used a branch as a
lever
to move huge stones or a sharp rock as a
wedge
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
Industrial Revolution
began in Great Britain, which sparked the use of machines including the
steam engine
. Steam began to be the source of power in most
factories
. Today we are part of the
computer age
because computers run many machines.
History of Machines
Watch this...
Two
inclined planes placed back to
back, used to
split
wood
Wedge
Wheel and Axle
Two
circular
objects fastened together that
rotate
on the same
axis
. Example: pedals on a bike
A
spiral
inclined plane, the
lid
to a jar
Screw
Lever
A stiff bar that
pivots
on a point called a
fulcrum
. A force exerted on some point on the bar moves
resistance
Activity:
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.
Full transcript