levers and pulleys not so simple machines!. just think…. could you lift your science teacher in...
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Levers and PulleysNot so simple machines!
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Just think…. Could you lift your science
teacher in the air?
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Keep Thinking…..(This means you don’t have to write this!!)
Building a house
Lifting a car
Building the pyramids
Handicap ramps
Paper cutters
Wheels on a car What do all of these have in common?
They are use simple machines!
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Important DefinitionsMachine- device for doing work
Complex machines have motors, simple machines do not
Effort- the amount of force applied to a machine Effort is measured in Newtons (N)
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Types of Simple MachinesLever
Pulley
Wheel and axle
Inclined plane
Wedge
Screw
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Just Read…Simple machines have been used for thousands of years. They were even used to help build the pyramids!
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LeversThe most simple and most common simple machine.
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3 Parts of a lever
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Class 1 Levers
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Class 1 LeversThe fulcrum is located somewhere between the
effort and the load
Examples include: The claw of a hammer crowbar
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Double Class 1 LeversTwo levers working together form a double
lever
Examples Include: Scissors Tin snips
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Class 2 Levers
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Class 2 LeversHas a fulcrum at one end of the lever arm
Examples include: Paper cutter Wheelbarrow
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Class 3 Levers
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Class 3 Levers In a class 3 lever, the fulcrum is at one end,
and the effort is applies between the fulcrum and the load
Examples include: Baseball bat Fishing pole Catapult
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Wheel and Axle
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Wheel and Axle
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Wheel and AxleCan be an actual wheel and axle OR a bar that
rotates around an axis
Examples include: Steering wheel A wrench turning a bolt (see levers and pulleys
book page 7) Windlass (crank used to raise a bucket, see page
8) Handle of a faucet (page 8)
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The Inclined Plane
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The Inclined Plane
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The Inclined PlaneA sloped, flat surface, or ramp
One-part simple machine that does not move
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Pulleys
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PulleysA pulley is a wheel that is free to turn on an
axle The wheel is called a sheave A pulley is considered to be a variation of the lever Pulleys can be fixed or movable