Science - Mechanical Systems 1.5 and 1.6

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24 Terms

1

Energy

the ability to do work

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2

Work

an action done whenever a force causes an object to move

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3

Kinetic energy

the energy of motion

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4

Potential energy

stored energy

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5

the law of conversion of energy

energy cannot be created or destroyed, only changed in form

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6

friction

a force that resists movement, resulting in loss of energy through heat

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7

efficiency

a value indicating how much energy is lost due to friction or heat, expressed as a percentage

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8

E=

Wo/Wi x 100

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9

Gears

rotating, wheel like objects with teeth cut ino the rim

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10

Gear train

a group of gears

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11

Parallel gears

driver and follower are the same size, MA=1

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12

MA=1

Change of direction (MA)

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13

Multiplying Gears

larger driver and smaller follower, MA<1

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14

MA<1

Speed advantage (MA)

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15

Reducing Gears

small driver and larger follower, MA>1

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16

MA>1

Force advantage (MA)

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17

MA=

#teeth follower/#teeth driver

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18

Speed ratio

the difference between the speeds of 2 gears

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19

SR=1

Change of direction (SR)

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20

SR<1

Force advantage (SR)

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21

SR>1

Speed advantage (SR)

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22

SR=

#teeth driver/#teeth follower

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23

Smaller gear

turns faster than larger gear

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24

Larger Gear

turns slower than smaller gear

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