Science - Mechanical Systems 1.3 - 1.4

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Mechanical Engineering

8th

Last updated 2:22 AM on 12/20/22
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17 Terms

1
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Mechanical advantage
a value that indicates how much a machine multiplies force or distance
2
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MA>1
force advantage (less force, more speed or distance)
3
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MA<1
speed or distance advantage (more force needed)
4
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MA=1
change of direction only
5
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Fi
Force input (load)
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Fo
Force output (effort force)
7
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Fixed pulley
a pulley that is attached and does not move
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MA=
Fo / Fi
9
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Pulley systems
made of multiple pulleys working together
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W=
Fxd
11
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the work you do
work input
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the work the machine does
work output
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Formula for Wi=
Fi x di
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Formula for Wo=
Fo x do
15
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What simple machines have an MA = 1
class 1 lever (fulcrum in the middle), and fixed pulley
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What simple machines have an MA < 1
class 1 lever (fulcrum closer to effort force), and class 3 lever
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What simple machines have an MA > 1
Class 1 lever (fulcrum closer to the load), class 2 lever, moveable pulley, pulley system, inclined planes