Simple Machines

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Simple Machines
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Common Simple Machines
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• First, rank the following words from 0-5 (0 you
  have never heard of this word 5 you know the
  word VERY well). Second, explain what the
  following terms mean in your own words
• Machine
• Simple machines
• Work
• Force
• Work input/Work output
• Lever

-Pulley -Wheel axle -Inclined
plane -Wedge -Screws -Compound machine
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The Six Simple Machines


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The Six Simple Machines
Lever

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The Six Simple Machines
Lever Pulley

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The Six Simple Machines
Lever Pulley Wheel Axle

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The Six Simple Machines
Lever Pulley Wheel Axel
Inclined Plane
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The Six Simple Machines
Lever Pulley Wheel Axel
Inclined Plane Wedge
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The Six Simple Machines
Lever Pulley Wheel Axle
Inclined Plane Wedge Screw
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Machine

• YOURS

• TEXTBOOK

• A machine is a device that makes work easier by
  changing the size or direction of a force.
• Examples wheelchair, scissors, chopsticks

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Simple Machines

• YOURS

• TEXTBOOK

• A machine or simple device without moving parts.
• Examples lever, pulley, wheel axle, inclined
  plane, wedge, screw

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Work

• YOURS

• TEXTBOOK

• Work is the transfer of energy to an object by
  using a force that causes the object to move in
  the direction of the force.
• Work is done on an object if two things happen
  1) the object moves as a force is applied, 2) the
  direction of the objects motion is the same as
  the direction of the force.
• Examples pushing a ball up a hill

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Work or Not Work?

• OR

• OR

YES
NO
YES
NO
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Force

• YOURS

• TEXTBOOK

• A push or a pull exerted on an object in order to
  change the motion of the object force has size
  and direction.
• Examples people, bulldozer, static electricity

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Work Input/Work Output

• YOURS

• TEXTBOOK

• Work input is the work done on the machine.
• Work out put is the work done by the machine.
• Examples opening a paint can

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Compound Machine

• YOURS

• TEXTBOOK

• A machine made up of more than one simple
  machine.
• Examples manual can opener

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The Six Simple Machines


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The Six Simple Machines
Lever

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Lever

• YOURS

• TEXTBOOK

• A lever is a simple machine that has a bar that
  pivots at a fixed point, called a fulcrum.
• Examples first-class lever (see saw),
  second-class lever (wheelbarrow or soda bottle
  opener), third-class lever (lifting weights or
  hammering a nail)

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Three Classes of Levers
First-Class Lever Second-Class Lever Third-Class Lever


Elementary School Middle School High School
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The Six Simple Machines
Lever Pulley

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Pulley

• YOURS

• TEXTBOOK

• A simple machine that has a grooved wheel that
  holds a rope or a cable.
• Examples fixed, moveable, block and tackle

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Types of Pulleys
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The Six Simple Machines
Lever Pulley Wheel Axle

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Wheel Axle

• YOURS

• TEXTBOOK

• A simple machine consisting of two circular
  objects of different sizes.
• Examples cars wheel axle, faucet

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The Six Simple Machines
Lever Pulley Wheel Axel
Inclined Plane
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The Six Simple Machines
Lever Pulley Wheel Axel
Inclined Plane Wedge
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Wedge

• YOURS

• TEXTBOOK

• A simple machine that is made up of two inclined
  planes that move often used for cutting.
• Examples knife, axe, door stop

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The Six Simple Machines
Lever Pulley Wheel Axel
Inclined Plane Wedge Screw
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Screw

• YOURS

• TEXTBOOK

• A simple machine that consists of an inclined
  plane wrapped around a cylinder.
• Examples screw, light bulb

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(No Transcript)
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1. What would be easier, a steep inclined plane
or a shallow inclined plane?
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2. What would be easier, a wide wedge or a skinny
wedge?
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3. What would be easier, a long, skinny screw or
a short, fat screw?
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4. What would be easier, the fulcrum in the
middle or the fulcrum to one side of the lever?
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5. What would be easier, a short axle or a long
axle?
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6. What would be easier, a wide rope or a skinny
rope?