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Simple Machines
What is a Simple Machine?
 A simple machine
  has few or no
  moving parts.
 Simple machines
  make work easier
Wheels and Axles
 The wheel and axle
  are a simple
  machine
 The axle is a rod
  that goes through
  the wheel which
  allows the wheel to
  turn
 Gears are a form of
  wheels and axles
Pulleys
 Pulley are wheels
  and axles with a
  groove around the
  outside
 A pulley needs a
  rope, chain or belt
  around the groove
  to make it do work
Inclined Planes
 An inclined plane is
  a flat surface that is
  higher on one end
 Inclined planes
  make the work of
  moving things easier
Wedges
 Two inclined
  planes joined
  back to back.
 Wedges are used
  to split things.
Screws
 A screw is an
  inclined plane
  wrapped around a
  shaft or cylinder.
 The inclined plane
  allows the screw
  to move itself
  when rotated.
Levers-First Class
 In a first class lever
  the fulcrum is in the
  middle and the load
  and effort is on
  either side
 Think of a see-saw
Levers-Second Class
 In a second class
  lever the fulcrum is
  at the end, with the
  load in the middle
 Think of a
  wheelbarrow
Levers-Third Class
 In a third class lever
  the fulcrum is again
  at the end, but the
  effort is in the
  middle
 Think of a pair of
  tweezers
Simple Machines
   Simple Machines
    can be put together
    in different ways to
    make complex
    machinery

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Simple machines

  • 2. What is a Simple Machine?  A simple machine has few or no moving parts.  Simple machines make work easier
  • 3. Wheels and Axles  The wheel and axle are a simple machine  The axle is a rod that goes through the wheel which allows the wheel to turn  Gears are a form of wheels and axles
  • 4. Pulleys  Pulley are wheels and axles with a groove around the outside  A pulley needs a rope, chain or belt around the groove to make it do work
  • 5. Inclined Planes  An inclined plane is a flat surface that is higher on one end  Inclined planes make the work of moving things easier
  • 6. Wedges  Two inclined planes joined back to back.  Wedges are used to split things.
  • 7. Screws  A screw is an inclined plane wrapped around a shaft or cylinder.  The inclined plane allows the screw to move itself when rotated.
  • 8. Levers-First Class  In a first class lever the fulcrum is in the middle and the load and effort is on either side  Think of a see-saw
  • 9. Levers-Second Class  In a second class lever the fulcrum is at the end, with the load in the middle  Think of a wheelbarrow
  • 10. Levers-Third Class  In a third class lever the fulcrum is again at the end, but the effort is in the middle  Think of a pair of tweezers
  • 11. Simple Machines  Simple Machines can be put together in different ways to make complex machinery

Editor's Notes

  1. A sloping surface, such as a ramp. An inclined plane can be used to alter the effort and distance involved in doing work, such as lifting loads. The trade-off is that an object must be moved a longer distance than if it was lifted straight up, but less force is needed. You can use this machine to move an object to a lower or higher place.  Inclined planes make the work of moving things easier.  You would need less energy and force to move objects with an inclined plane.