SIMPLE MACHINES

1
SIMPLE MACHINES

• What are SIMPLE MACHINES?

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LEVERS

• First - class lever (seesaw)
• What is a fulcrum?
• Second - class lever (bottle opener)
• Third - class lever (serving in tennis)

3
PULLEYS

• Wrap a rope around a wheel
• Tie one end of the rope to an object
• Pull the other end and the object is lifted

4
WHEELS AND AXLES

• Wheel and axle is a kind of lever
• It moves around a fulcrum
• The parts move together

5
INCLINED PLANES

• Flat surface that is raised at one end
• It is easier to push something up a ramp
• Why is it easier?
• Less force is needed

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WEDGES

• Two inclined planes meet to make a sharp edge
• What are the uses of a wedge?
• Wedges cut or break things apart

7
SCREWS

• Another kind of inclined plane
• Forms a spiral by winding around an inclined
  plane
• What are they used for?
• Hold things together, make holes, or help lift
  things

8
COMPOUND MACHINES

• Made up of two or more simple machines
• What does a compound machine do?
• Increases the force to make work easier