unit 1

Question 1

what is a field

Answer 1

your academic training. what you studied in school

Question 2

what is a focus

Answer 2

how you work in your job

Question 3

examples of a focus

Answer 3

design, process, production

Question 4

what does ASME international stand for

Answer 4

American society of mechanical engineers

Question 5

why was ASME international created

Answer 5

boilers used to run power plants were exploding

Question 6

what was the first code written by ASME international

Answer 6

rules for conducting boiler tests

Question 7

what is a code

Answer 7

a standard that is being passed as law

Question 8

what is a standard

Answer 8

a recommended way of doing something

Question 9

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

Answer 9

• professional development
• scientific journals

Question 10

what should every calculation have

Answer 10

a numerical value and dimensions with units (unless dimensionless)

Question 11

what is a dimension

Answer 11

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

Question 12

what is a unit

Answer 12

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

Question 13

what are base units

Answer 13

fundamental units

Question 14

what are examples of base units in SI

Answer 14

second, kelvin, mole, meter, kg

Question 15

what are derived units

Answer 15

a combination of base units

Question 16

what are examples of derived units in SI

Answer 16

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

Question 17

what are order of magnitude prefixes

Answer 17

the describe very large or very small numbers

Question 18

examples of order of magnitude prefixes

Answer 18

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

Question 19

viscosity unit

Answer 19

kg/ (m x s)

Question 20

what are the 3 problem solving steps

Answer 20

1. approach
2. solution
3. discussion

Question 21

what do you do during the approach step of problem solving

Answer 21

write down your given info and summary

Question 22

what do you do during the solution step of problem solving

Answer 22

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

Question 23

what do you do during the discussion step of problem solving

Answer 23

major calculations and check your work

Question 24

what does dimensional consistency (homogeneity) say

Answer 24

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

Question 25

what does newton's 1st law say

Answer 25

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

Question 26

what do we know newtons 1st law as

Answer 26

inertia/ momentum

Question 27

what does newtons 2nd law say

Answer 27

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

Question 28

what equation do we associate with newtons 2nd law

Answer 28

F=ma

Question 29

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

Answer 29

f=ma=0

Question 30

what does newtons 3rd law say

Answer 30

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

Question 31

summary of newton's 3rd law

Answer 31

every action has an equal and opposite reaction

Question 32

what are scalers

Answer 32

quantities described by magnitude and units

Question 33

why are 4 examples of scalers

Answer 33

speed, mass, pressure, distance (magnitude)

Question 34

what are vectors

Answer 34

quantities described by magnitude and direction

Question 35

what does the law of sines say

Answer 35

a/sinA= b/sinB= c/sinC

Question 36

what does the law of cos say

Answer 36

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

Question 37

what are the 3 steps of the vector polygon method

Answer 37

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

Question 38

what are the 3 steps of the vector algebra method

Answer 38

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

Question 39

what is a moment

Answer 39

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

Question 40

is counterclockwise positive or negative

Answer 40

positive

Question 41

what do engineers do

Answer 41

1. structures 2. materials 3. system integrations 4. services

Question 42

what is structures

Answer 42

large buildings used in everyday life

Question 43

what is materials

Answer 43

mining, processing, developing

Question 44

what is system integrations

Answer 44

making different systems work together

Question 45

what is services

Answer 45

supply chains- Fedex, amazon, etc

Question 46

what do mechanical engineers do

Answer 46

- research -design -develop -test -manufacture tools, technology, machinery...

Question 47

what is the weight equation

Answer 47

weight= mass x gravity

Question 48

slug unit

Answer 48

(lbs x s^2)/ ft

Question 49

what is a newton

Answer 49

(kg x m)/ s^2

Question 50

units of Mo in SI

Answer 50

N x m

Question 51

units of Mo in USCS

Answer 51

theta x distance

Question 52

what are the 3 static equilibrium equations

Answer 52

1. ΣFx, i = 0 2. ΣFy, i = 0 3. ΣMo, i = 0

Question 53

particle

Answer 53

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

Question 54

rigid body

Answer 54

forces distributed over dimension in x,y directions

Question 55

free body diagrams

Answer 55

sketch of the system you are analyzing

Question 56

what are the 3 steps to drawing a free body diagram

Answer 56

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

Question 57

what is included when you isolate the component

Answer 57

only applied forces and reaction forces

Question 58

what do you do if a reaction force direction is unknown

Answer 58

you assume (guess)

Question 59

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

Answer 59

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