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Simple Machines

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Types of Simple Machines How do machines make work ... What are simple machines? A Simple Machine is a device that ... The gear ratio is found by dividing the ... – PowerPoint PPT presentation

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Title: Simple Machines


1
Simple Machines
2
Types of Simple Machines
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How do machines make work easier?
  • Machines make work easier by
  • multiplying the size of the force
    you exert (such as in this
    pulley
    system).

5
  • Machines also make work easier by changing
    direction of the force. Example A force on the
    rope downward, hoists the weight upward.

6
What are simple machines?
  • A Simple Machine is a device that does work with
    one movement.

7
LEVERS
  • A lever is a bar that is free to pivot, or turn
    at one fixed point. The fixed point is called a
    fulcrum.

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  • The part of the lever on which the effort force
    is applied is called the effort arm.
  • The part of the lever that exerts the resistance
    force is called the resistance arm.

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First Class Lever
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Examples of First Class Levers
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Second Class Lever
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Third Class Lever
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PULLEYS
  • A pulley is a grooved wheel with a rope or chain
    that works something like a first class lever.

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Comparing pulleys to levers
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Pulleys can be FIXED or MOVABLE.
  • The movable pulley has a greater mechanical
    advantage and therefore multiples the effort
    force by a greater amount.

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More pulleys --More rope--Less effort
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WHEEL AND AXLE
  • Simple machine consisting of two wheels of
    different sizes that rotate together. The smaller
    wheel is usually called the axle. (Effort force
    usually applied to larger wheel.)

27
Gearsmodified wheel axle
  • The effort is applied to one gear. The gear
    ratio is found by dividing the radius of the
    effort gear by the radius of the resistance gear.
    (This is the ideal mechanical advantage for the
    gears.)

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The SCREW
  • A screw is an inclined plane wrapped in a spiral
    around a cylindrical post.

30
The wedge
  • A wedge is an inclined plane with one or two
    sloping sides.
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