Study your flashcards anywhere!
Download the official Cram app for free >
 Shuffle Toggle OnToggle Off
 Alphabetize Toggle OnToggle Off
 Front First Toggle OnToggle Off
 Both Sides Toggle OnToggle Off
 Read Toggle OnToggle Off
How to study your flashcards.
Right/Left arrow keys: Navigate between flashcards.right arrow keyleft arrow key
Up/Down arrow keys: Flip the card between the front and back.down keyup key
H key: Show hint (3rd side).h key
A key: Read text to speech.a key
90 Cards in this Set
 Front
 Back
What is the unifying equation for force?

Force= Mass x Acceleration
F=MA 

What is a force?

A force is a push or pull that causes change in shape


What is mass?

total amount of matter in an object


What are the units for mass?

SI  grams
English  poundmass 

What is weight?

measurement of gravity time mass


What is gravity in SI units?

9.8 m/s²


What is torque?

forcelike quantity in rotational mechanical systems


What is torque measured in?

SI  Nm
English  lb*ft 

When forces act in the same direction, the ____ ______ is the sum of the 2 forces

net force


When opposing forces are equal, they are said to be in a state of ________

equillibrium


What are prime movers?

forcelike quantities in mechanical systems


What is the prime mover for thermal systems?

Temperature differences


Density is found by dividing...

mass by volume
M/V 

The density of a substance divided by the density of water is known as...

specific gravity


What measures density or specific gravity of liquids?

hydrometer


______ is measured by dividing a unit of force by a unit of area.

Pressure


What is the english unit for pressure?

psi


What device is used to measure pressure differences?

manometers


The two types of fluid systems are...

Hydraulic & Pneumatic


What fluid does a hydraulic system use?

liquids


_____ are compressible.

gasses


______ are not compressible

liquids


Pressure increases with ______

depth


______ ______ is measured from a zero pressure

absolute pressure


What is atmospheric pressure in psi?

14.7 psi


What is the weight density of water?

62.4 lbs/ft^3


Voltage comes in what two forms?

AC & DC


What is the most common form of DC current?

Batteries


The alternating of AC current is measured in ______

hertz


The alternating of AC current is known as ________

frequency


__________ measure voltage difference

Voltmeters


Multimeter measure voltage, ______, and __________ (in ohms)

amperage
resistance 

The positive pole in a battery is the ______

anode


The negative pole in a battery is the ______

cathode


What are the 4 basic items in a simple electrical circuit?

1. source (power supply)
2. conductors (wires) 3. load (what is powered) 4. control element (switch) 

What is the prime mover in thermal systems?

Temperature difference


_______ is the measure of the average energy of motion of molecules in a substance.

Temperature


________ use three wires of two different metals to measure temperature

Thermocouples


Where is the degree symbol normally placed.

Before the unit (°F)


Where is the degree symbol placed when giving a temperature difference

After the unit (F°)


In the equation for work, force is a _______ and distance is a _______

forcelike quantity
displacementlike quantity 

________ work is the work going into a system

input


_________ work is work the system does

output


__________ =Output work/Input work x 100% and the total cannot exceed 100%

efficiency


Spring scale measure input and _______ output force

output


In rotational mechanical systems...
angle of movement is symbolized by ________ 


What is the basic english unit for work?

footpounds (ft*lb)


The basic SI unit for work is what?

Newtonmeter (Nm)


1 Nm = 1 _____

joule


__________ __________ _____ is performed when work is done in a straight line

linear mechanical work


_________ ____________ ____ is work done around an axis or a rotation

Angular rotational work


Mechanical work causes an object to start moving, _____ ______, or change ________

stop
moving direction 

What is the equation for fluid work?

W=∆p*V.
pressure difference * volume 

The formula for fluid work can also be expressed as...

W=p*∆V
pressure * volume difference 

when the given height for a fluid is raised, you must also know the ____ ______ of the fluid to calculate fluid work

weight density


In a _____ fluid system the fluid is reused

closed


There is no such thing as _______ or ________ fluid work

angular
linear 

The crosssectional area of a cylinder can be found by multiplying __________ by the diameter²

0.7854


a ______ is a quantity of charge that is = 6.25*10^18 electrons

coulomb


What symbol is used in an equation for a coulomb

q


Electrical charge can be calculated by multiplying amps by time. What unit cancels

time


What is the basic unit for electrical work

joule


Input work is performed by an electric pump or motor will be given in _______

joules


a rate is a displacementlike quantity divide by an ______ ____

elapsed time


Velocity is a ________ that is the measure of linear mechanical _______

vector (amount and direction)
rate 

______ is similar to velocity

speed


Units for linear mechanical rate are ___/____ (english) or ____/____ (SI)

ft/sec
m/sec 

Angular rate is expressed in ____/____ (SI) or _____/____ (english)

rad/sec
rev/min 

6.28 rads = one ______

revolution


Acceleration is the rate at which speed ________ or __________

increases or decreases


Flow rate is the volume of fluid moved in a given period of ____

time


Units of fluid flow are

gallons/min


_________ is the quality of a substance related to its thickness; it can be reduced be heating up

viscosity


Under the same pressure, a larger pipe will have a ______ flow rate than a smaller pipe

higher


____________ rate is the amount of charge moved in a given amount of time

electrical rate`


current is symbolized (in equations) by

I


a milliampere =

1/1000 amps


a microampere =

1*10^ 6


an ammeter is used to measure

current


________ measure frequency of alternating current

Hertz


an _________ can measure frequency as well as voltage

oscilloscope


Heat flow rate is symbolized by

Qh


Units of heat include:

English : BTU's
SI : calorie 

________ ________ is used to contain/store heat energy

dewar flask


a ______________ thermometer can be used to measure heat flow rate

thermocouple


What is the unifying equation for resistance

Force
_____ Rate 

The 2 forms of resistance in mechanical system are

friction and drag


Equation of force of friction is

Force times coefficent of friction


_________ friction must be overcome to start an object in motion

sliding


_________ friction must be overcome to keep an object in motion

kinetic
