Mechanical Advantage

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33 Terms

1

Effort Force (Fe)/Input force

The force that is pushing/pulling an object)

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2

Load Force/Resistance Force( Fl) or (Fr)

the force that is being acted upon/the force that is being lifted

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3

True or False: Weight is a unit of force

True

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4

Effort Distance:

The effort forces distance from the fulcrum

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5

Load Distance

The load forces distance from the fulcrum

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6

What does a mechanical advantage of 2 mean?

The effort distance is twice as large as the load distance; the load force is twice as large as the effort force

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7

Is more effort force required if the load distance is greater?

Yes

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8

What is mechanical advantage?

How useful or helpful a machine is;

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9

True or False: The mechanical advantage has units

FALSE

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10

What is Ideal Mechanical Advantage (IMA) and what is used to calculate it?

The theoretical mechanical advantage; Uses effort and load distance

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11

What is Actual Mechanical Advantage (AMA) and what is used to calculate it?

Realistic Mechanical advantage; takes into account energy loss, wind resistance, etc. Uses effort and load force

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12

What is the formula for AMA?

Load force divided by effort force

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13

What is the formula for IMA

Effort distance divided by Load distance

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14

True or False: AMA will always be greater than IMA

False; AMA will always be less than

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15

How do you calculate the efficiency of a machine?

AMA divided by IMA; will never be 100 percent

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16

What is considered a mechanical advantage?

If the MA is less than 1

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17

What does a mechanical advantage of 0.25 or 1/4 mean?

4x more effort force is required; Effort distance is 4x closer to the fulcrum than the load distance

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18

Why operate a machine with a mechanical advantage of 1?

To lift a load as high as possible with the least amount of effort

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19

What is the mechanical advantage if the effort distance is 6 cm and the load distance is 12cm?

1/2

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20

What is moment

Rotational force ; Force times distance

<p>Rotational force ; Force times distance</p>
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21

How does moment work in a first class lever?

Load force causes moment in one direction; effort force causes moment in the opposite direction

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22

How do you increase the magnitude of a moment?

Increase the distance

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23

How can a 4kg and 5 kg stack of bricks balance?

The 4kg stack is 5 spaces away; the 5kg stack is 4 spaces away from the fulcrum

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24

What are characteristics of a first class lever?

The load and effort distance are on opposite sides of the fulcrum; the effort and load force are exerted in the same direction

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25

What are characteristics of a second class lever?

The fulcrum is on the end; The load force is exerted in the middle; the effort distance is always greater than the load distance; Effort and load forces are exerted in opposite directions; Effort is on the end

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26

What are characteristics of a third class lever?

Fulcrum is on the end; Effort and load forces are exerted in opposite directions; Effort force is always closer to the fulcrum than the load force; Load is on the end

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27

True or False: The Mechanical Advantage of a third class lever will always be greater than 1?

False: the MA will always be less than 1 since the effort force is closer to the fulcrum

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28

What is the MA of a second class lever?

MA>1

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29

What class lever is the most efficient?

2nd; the effort distance is always farther away meaning less force is required to lift the load

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30

Classify the lever?

2nd class

<p>2nd class</p>
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31

Classify the lever

2nd class

<p>2nd class</p>
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32

Classify the lever

3rd class

<p>3rd class</p>
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33

Classify the lever

1st class

<p>1st class</p>
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