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mechanical engineering > unit 1 > Flashcards

unit 1 Flashcards

1
Q

what is a field

A

your academic training. what you studied in school

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2
Q

what is a focus

A

how you work in your job

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3
Q

examples of a focus

A

design, process, production

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4
Q

what does ASME international stand for

A

American society of mechanical engineers

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5
Q

why was ASME international created

A

boilers used to run power plants were exploding

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6
Q

what was the first code written by ASME international

A

rules for conducting boiler tests

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7
Q

what is a code

A

a standard that is being passed as law

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8
Q

what is a standard

A

a recommended way of doing something

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9
Q

what else is ASME international involved in other than creating codes and standards

A
  • professional development
  • scientific journals
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10
Q

what should every calculation have

A

a numerical value and dimensions with units (unless dimensionless)

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11
Q

what is a dimension

A

a generic description of a physical quantity without units (length, mass, time)

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12
Q

what is a unit

A

measure of a dimension in a specific system (us customary, international)

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13
Q

what are base units

A

fundamental units

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14
Q

what are examples of base units in SI

A

second, kelvin, mole, meter, kg

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15
Q

what are derived units

A

a combination of base units

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16
Q

what are examples of derived units in SI

A

micron, liter, pascal, jule, watt, cm, newton

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17
Q

what are order of magnitude prefixes

A

the describe very large or very small numbers

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18
Q

examples of order of magnitude prefixes

A

terawatt: 10^12 W
nanosecond: 10^-9 sec
mega: 10^6
milli: 10^-3

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19
Q

viscosity unit

A

kg/ (m x s)

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20
Q

what are the 3 problem solving steps

A
  1. approach
  2. solution
  3. discussion
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21
Q

what do you do during the approach step of problem solving

A

write down your given info and summary

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22
Q

what do you do during the solution step of problem solving

A

sketch, substitute numbers an units into the equation, show work, simplify, solve, round

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23
Q

what do you do during the discussion step of problem solving

A

major calculations and check your work

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24
Q

what does dimensional consistency (homogeneity) say

A

dimensions (units) must cancel out on each side of the equation

25
Q

what does newton’s 1st law say

A

every object remains at rest or uniform motion of a constant velocity unless acted upon by an external, unbalanced force

26
Q

what do we know newtons 1st law as

A

inertia/ momentum

27
Q

what does newtons 2nd law say

A

an object with mass, m, subject to force, f, experiences acceleration in the same direction as the force

28
Q

what equation do we associate with newtons 2nd law

A

F=ma

29
Q

when there is a static equilibrium what does the f=ma equation equal

A

f=ma=0

30
Q

what does newtons 3rd law say

A

the force of an action exerted by body 1 onto body 2 is equal, opposite, and collinear

31
Q

summary of newton’s 3rd law

A

every action has an equal and opposite reaction

32
Q

what are scalers

A

quantities described by magnitude and units

33
Q

why are 4 examples of scalers

A

speed, mass, pressure, distance (magnitude)

34
Q

what are vectors

A

quantities described by magnitude and direction

35
Q

what does the law of sines say

A

a/sinA= b/sinB= c/sinC

36
Q

what does the law of cos say

A

c^2= a^2 + b^2 -2ab cos(c)

37
Q

what are the 3 steps of the vector polygon method

A
  1. draw 1 vector in appropriate length and direction
  2. draw 2nd vector beginning at the tip of the 1st
  3. the resultant should connect the vectors
38
Q

what are the 3 steps of the vector algebra method

A
  1. break each vector into rectangular form
  2. add the x components for Rx
  3. repeat in the y direction
39
Q

what is a moment

A

the tendency of a force to cause a rotation. the rotation does not have to actually occur.

40
Q

is counterclockwise positive or negative

A

positive

41
Q

what do engineers do

A
  1. structures
  2. materials
  3. system integrations
  4. services
42
Q

what is structures

A

large buildings used in everyday life

43
Q

what is materials

A

mining, processing, developing

44
Q

what is system integrations

A

making different systems work together

45
Q

what is services

A

supply chains- Fedex, amazon, etc

46
Q

what do mechanical engineers do

A
  • research
    -design
    -develop
    -test
    -manufacture
    tools, technology, machinery…
47
Q

what is the weight equation

A

weight= mass x gravity

48
Q

slug unit

A

(lbs x s^2)/ ft

49
Q

what is a newton

A

(kg x m)/ s^2

50
Q

units of Mo in SI

A

N x m

51
Q

units of Mo in USCS

A

theta x distance

52
Q

what are the 3 static equilibrium equations

A
  1. ΣFx, i = 0
  2. ΣFy, i = 0
  3. ΣMo, i = 0
53
Q

particle

A

a point in space so small it doesn’t have any dimensions (no moments)

54
Q

rigid body

A

forces distributed over dimension in x,y directions

55
Q

free body diagrams

A

sketch of the system you are analyzing

56
Q

what are the 3 steps to drawing a free body diagram

A
  1. draw component under analysis and isolate from it’s surroundings
  2. draw coordinate system
  3. dimensions, angles, direction of gravity, etc.
57
Q

what is included when you isolate the component

A

only applied forces and reaction forces

58
Q

what do you do if a reaction force direction is unknown

A

you assume (guess)

59
Q

if you assume the directions, how do you know if you assumed correctly?

A

if the reaction force is >0, the direction is correct. if the reaction force is <0, the direction is incorrect

mechanical engineering (1 decks)

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