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90 Cards in this Set
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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
