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Science - Mechanical Systems 1.5 and 1.6
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Mechanical Engineering
8th
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24 Terms
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1
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Energy
the ability to do work
2
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Work
an action done whenever a force causes an object to move
3
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Kinetic energy
the energy of motion
4
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Potential energy
stored energy
5
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the law of conversion of energy
energy cannot be created or destroyed, only changed in form
6
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friction
a force that resists movement, resulting in loss of energy through heat
7
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efficiency
a value indicating how much energy is lost due to friction or heat, expressed as a percentage
8
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E=
Wo/Wi x 100
9
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Gears
rotating, wheel like objects with teeth cut ino the rim
10
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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
12
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MA=1
Change of direction (MA)
13
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Multiplying Gears
larger driver and smaller follower, MA
14
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MA
Speed advantage (MA)
15
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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
19
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SR=1
Change of direction (SR)
20
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SR
Force advantage (SR)
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SR>1
Speed advantage (SR)
22
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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
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