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Work, Power and Simple Machines

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... makes work easier Work input is the amount of work put into a machine Work output is the amount of work done by the machine Machines make work ... gear shifter ... – PowerPoint PPT presentation

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Title: Work, Power and Simple Machines


1
Work, Power and Simple Machines
  • Chapters 13 14

2
Work
  • Work is a force exerted over a certain distance
  • Work Force x Distance
  • Work is measured in Joules (J)

3
Power
  • Power is the rate at which work is done
  • Power work/time
  • Power f x d/time
  • Power is measured in Watts (W)

4
Machines
  • A machine is an instrument that makes work easier
  • Work input is the amount of work put into a
    machine
  • Work output is the amount of work done by the
    machine
  • Machines make work easier b/c they change either
    the size or the direction of the force put into
    the machine

5
Simple Machines
6
Six Simple Machines
  • Inclined Plane
  • Wedge
  • Screw
  • Lever
  • Pulley
  • Wheel and Axle

7
Inclined Plane
  • Inclined plane is a flat slanted surface
  • Example- ramps
  • A ramp decreases the amount of force you need to
    exert, but increases the distance traveled

8
Wedge
  • A wedge is an inclined plane that moves
  • Examples door stop, knife, scissors, axe, edges
    of key, zipper, wood splitter

9
Screw
  • A screw is an inclined plane wrapped around a
    central cylinder
  • Examples wood screw, cork screw, light bulb,
    spark plug, jar lid

10
Lever
  • A lever is a rigid bar that is free to move about
    a fixed point.
  • Fixed point fulcrum
  • Examples crowbar, seesaw, rake, dolly, fishing
    pole, gear shifter, wheelbarrow, hammer

11
Pulley
  • A pulley is a rope, belt, or chain wrapped around
    a grooved wheel
  • Examples crane, window shade, flag pole,
    sailboat, elevator

12
Wheel and Axle
  • A wheel and axle is a machine made up of 2
    circular objects of different sizes.
  • Wheel is the larger object
  • Axle is the smaller object
  • Examples bikes, ferris wheel, door knobs,
    wrench, steering wheel

13
Compound Machine
  • A combination of two or more simple machines
    working together.
  • Examples washing machine, blender, DVD player,
    sewing machine, vacuum cleaner, toaster.

14
Compound Machine
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