Science - Mechanical Systems 1.5 and 1.6

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Mechanical Engineering

8th

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24 Terms

1
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Energy
the ability to do work
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Work
an action done whenever a force causes an object to move
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Kinetic energy
the energy of motion
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Potential energy
stored energy
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the law of conversion of energy
energy cannot be created or destroyed, only changed in form
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friction
a force that resists movement, resulting in loss of energy through heat
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efficiency
a value indicating how much energy is lost due to friction or heat, expressed as a percentage
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E=
Wo/Wi x 100
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Gears
rotating, wheel like objects with teeth cut ino the rim
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Gear train
a group of gears
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Parallel gears
driver and follower are the same size, MA=1
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MA=1
Change of direction (MA)
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Multiplying Gears
larger driver and smaller follower, MA
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MA
Speed advantage (MA)
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Reducing Gears
small driver and larger follower, MA>1
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MA>1
Force advantage (MA)
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MA=
\#teeth follower/#teeth driver
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Speed ratio
the difference between the speeds of 2 gears
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SR=1
Change of direction (SR)
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SR
Force advantage (SR)
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SR>1
Speed advantage (SR)
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SR=
\#teeth driver/#teeth follower
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Smaller gear
turns faster than larger gear
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Larger Gear
turns slower than smaller gear