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Simple Machines - PowerPoint PPT Presentation


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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

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Presentation Transcript
what is a simple machine
What is a Simple Machine?
  • A simple machine has few or no moving parts.
  • Simple machines make work easier
wheels and axles
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
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
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
Wedges
  • Two inclined planes joined back to back.
  • Wedges are used to split things.
screws
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
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
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
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 vs compound machines
Simple vs. Compound Machines
  • Simple Machines can be put together in different ways to make compound machines or complex machinery.
example of compound machine
Example of Compound Machine
  • Wedge 
  • Lever 
answer for bike question
Answer for bike question:
  • A bike is compound machine. Screws are used to hold the pieces together. The wheel of a bicycle is a wheel and axle. The pedals are also examples of this simple machine. The pedals are attached to a lever that turns a pulley. The gear shifts and brake handles are levers.