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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 - pound-mass
What is weight?
measurement of gravity time mass
What is gravity in SI units?
9.8 m/s²
What is torque?
force-like 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?
force-like 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 _______
force-like quantity

displacement-like 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?
foot-pounds (ft*lb)
The basic SI unit for work is what?
Newton-meter (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 cross-sectional 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 displacement-like 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