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Title:

Simple Machines

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Simple Machines Machines Lever Inclined plane Pulley Screw Wedge Wheel & axle Machines Device to multiply force or change its direction Can t increase work done ... – PowerPoint PPT presentation

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Title: Simple Machines


1
Simple Machines
2
Machines
  • Lever
  • Inclined plane
  • Pulley
  • Screw
  • Wedge
  • Wheel axle

3
Machines
  • Device to multiply force or change its direction
  • Cant increase work done
  • Work put into machine must be at least as great
    as the work output of machine

4
Machines
  • Since work is force times distance, input force
    can be decreased by increasing input distance
    force is multiplied
  • Work is made easier because less force is needed
  • Sometimes output distance is increased by
    increasing input force distance is multiplied

5
Efficiency
  • Work output divided by work input (x 100 for )
  • A measure of losses due to friction
  • Efficiency is always less then 100

6
Mechanical Advantage
  • A measure of how much the effect of the force is
    increased
  • Actual M.A. is ratio of output force to input
    force
  • Theoretical M.A. can be found from the design of
    the machine

7
Mechanical Advantage
  • For lever, theoretical MA is input distance /
    output distance
  • For inclined plane it is plane length / height
  • For pulley system it equals the number of cords
    supporting the weight being lifted

8
Summary
  • Machines help us do work by using less force over
    greater distance
  • Mechanical Advantage output force / input force
  • Efficiency work out / work in
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