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Moco > First Semester > Flashcards

First Semester Flashcards

(53 cards)

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1
Q

Work

A

/ft

Work * distance

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2
Q

2nd rule of machines

A

Machine enable us to amplify speed at the expense of force

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3
Q

5 simple/ancient machines

A 
Lever
Pulley
Wheel & axel
Inclined plane/wedge
Screw
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4
Q

Chains

A

Won’t slip compared to vbelts

Load is based on lubrication (we use type 1 lube)

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5
Q

|

A

110 v

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6
Q

Newton’s 3rd Law

A

Every action has equal opposite reaction

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7
Q

Friction

A

Resistance that keeps 2 objects from slipping and moving past each other

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8
Q

Wedge IMA

A

Length(diag)/height

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9
Q

3rd rule of machines

A

Can’t do both rules at same time

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10
Q

Inertia

A

Tendency of an object to continue moving or not

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11
Q

Unit for torque

A

Ft/#’s

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12
Q

Torque

A

Twisting motion about an axis

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13
Q

2nd Class Lever

A

Load located between fulcrum and force

Ratio of 1:2

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14
Q

Work

A

Force * distance

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15
Q

Prime mover

A

Source of input power to the system

-might be motor, engine, gravity, freshman

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16
Q

Parallel

A

Parallel lines

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17
Q

Screw effort force

A

Resist force/(IMA*efficiency)

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18
Q

Machine rules

A

Machine must have more power than load

Drive system/transmission must have greater power capacity than the motor

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19
Q

1st class lever

A

Fulcrum in between load and force

Ratio of 1

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20
Q

Efficiency

A

AMA/IMA

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21
Q

EMF

A

Electromotive force

Photoelectric
Thermoelectric
Mechanical magnetic
Piezoelectric friction

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22
Q

Acceleration

Study These Flashcards
A

Rate @ which we change speed/sec

23
Q

Minimum belt contact

Study These Flashcards
A

150 degrees so you have friction

24
Q

Cheapest gears to maintenance

Study These Flashcards
A

Spur gears

-noisy

25
1 HP = ____ #/1 Ft/ 1 Sec
550#
26
West VirginiA
Watts = volts • amps
27
Hots in 220 load if coming from 220 source
2
28
Pulley IMA
of lines supporting load, 4:1, 3:1, etc
29
Hots in 110
1 hot | 1 neutral
30
Wedge AMA
IMA * efficiency (given)
31
Moment arm * force
Torque
32
Helical gears
Converts more torque at a time - more expensive - introduces lateral force
33
Belt advantages
Inexpensive in relation to gearboxes Require little maintenance, no grease or oil Can tolerate high misalignment Slipping can be advantageous
34
Wheel Axle IMA
Rw/Ra Radius of wheel/radius of axle
35
IMA
Displacement Effort/ Displacement resistance = IMA
36
3rd Class Lever
Force located between fulcrum and load
37
Differential chain hoist IMA
2R/R-r R = big radius r = small radius
38
4 parts of useful electrical circuit
Source of EMF conductor Load Control
39
How many watts in 1 HP
746 Watts
40
Series
Erasing line after first stop to first on
41
Bevel gears
90 degree similar to spur gears | Inexpensive
42
Newton’s 1st Law
Object at rest will stay at rest, object in motion will stay in motion unless acted on by outside force
43
1st rule of machines
Enable us to amplify force at expense of distance/speed
44
Angle of repose
Angle before impending motion
45
7 reasons why we automate
1. Weight 2. Repeat 3. Money 4. Speed 5. Complexity 6. Accuracy 7. Education
46
F=MA
Amount of force to overcome the inertia of an object
47
Screw IMA
Circumference of handle/Pitch =2*3.14*r/Pitch
48
Newton’s 2nd Law
When force applied to object, object will move in direction of force
49
Point of impending motion
When force of the effort overcomes static friction
50
RPM formula
(Distance/time)*12 /drum circumference *60
51
AMA
Fr/Fe=AMA
52
Herring bone fear
No lateral force cause 2 of them Can do twice the work -more expensive
53
Pulley AMA
load/force

Moco (4 decks)

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