Transcript Simple Machines

Simple Machines and Compound
Machines Project
By Alex Rae
James Drury
Anthony Hirsch
Ian Briggs
Table of Contents
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Wheel and axle
Pulley
Screw
Lever
Inclined Plane
Wedge
Compound Machines
Bibliography
Back to title page
Wheel and Axle
• A wheel and axle is a simple machine made of two
circular or cylindrical objects that are fastened together
and that rotate about a common axis
• The advantage of a wheel and axle is when you apply an
input force to turn the wheel, the axle rotates and exerts
an output force to turn something, such as a screw
• To calculate the mechanical advantage of a wheel and
axle you use this formula:
• Ideal Mechanical advantage= Radius of Wheel
Radius of axle
Back
Pulley
• A pulley is a grooved wheel with a rope (or a chain, or even a
steel cable) wrapped around it
• The advantage of a pulley is when you pull on the rope of the
pulley, you can change the amount and direction of your input
force
• To find the mechanical advantage of a pulley, you need to
know what type of pulley it is
• A fixed pulley has an I.M.A. of 1
• A movable pulley has an I.M.A. of 2
• A pulley system’s I.M.A. is equal to the number of sections of
the rope that support the object
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Back
The Screw
See Picture
• The screw is related to the inclined plane
• The definition of a screw is a shaft with a
helical groove or thread formed on its surface
and provision at one end to turn the screw
• Its main uses are as a threaded fastener used
to hold objects together
• Some examples of screws are bolts, faucets,
and jar lids
Back
Levers
See Picture
• If you have ever ridden on a seesaw or pried open a can
of paint then you are familiar with levers
• The definition of a lever is a rigid object that is used with
an appropriate fulcrum or pivot point to multiply the
mechanical force that can be applied to another object
• To find the mechanical advantage of a lever, you use this
formula:
• I.M.A.= Distance from fulcrum to input force
Distance from fulcrum to output force
Lever
This is a picture of a lever-a seesaw.
Back to Lever Page
Screw
This is a picture of a screw .
Back to Screw Page
Inclined Plane
• An inclined plane is a flat, slanted surface
• An inclined plane allows you to exert your input force
over a longer distance, which means your input force
needed will be less than your output force
• You can calculate the I.M.A. of an inclined plane with
this formula:
• Ideal mechanical advantage= Length of incline
Height of incline
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Cool Videos
Watch these videos on inclined planes
• http://www.ngsir.netfirms.com/englishhtm/Incline.htm
• http://video.google.com/videoplay?docid=6597803898457949836&q=inclined+plane&total=56&start=0&num=10&s
o=0&type=search&plindex=5
Back to Inclined Planes Page
Wedge
• A wedge is a portable inclined plane, used
either to separate two objects, or portions of
objects, lift an object, or hold an object in
place,
• It is a device that is thick at one end and
tapers to a thin edge at the other end
• Examples would be an ax and a zipper
Back
Back
Compound Machines
• A compound machine a machine that utilizes
2 or more simple machines
• An example of a compound machine is a
pencil sharpener, a clock, or any other
machine that uses gears
• To find the I.M.A. of a compound machine,
you need to know the I.M.A. of each
individual simple machine
Cool Video
See Pictures
Compound Machines Video
• http://www.edheads.org/activities/odd_mach
ine/
• Please try to answer the questions in the
video as best as you can because your score
will be displayed at the end
Back to Compound Machines Page
Examples of Compound Machines
Back to Compound Machines Page
Bibliography
• Picture on table of contents- Ms. Brooks webpagehttp://www.jenkintown.org/teachers/tlesson.php?lid=93&view=
t
• All other pictures- Google Imageshttp://images.google.com/imghp?tab=wi
• Inclined Plane Video #1http://www.ngsir.netfirms.com/englishhtm/Incline.htm
• Inclined Plane Video #2- Google Videoshttp://video.google.com/videoplay?docid=6597803898457949836&q=inclined+plane&total=56&start=0&n
um=10&so=0&type=search&plindex=5
• Compound Machines Videohttp://www.edheads.org/activities/odd_machine/
• Facts- Science textbook and google searches
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