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100 Cards in this Set
- Front
- Back
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mass times acceleration equals
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force
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a ____ is a push or pull
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force
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total amount of matter in an object
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mass
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gravity times mass equals
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weight
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force-like quantity in rotational mechanical system
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torque
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net force is the sum of what
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two forces acting in the same direction
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prime movers?
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pressure diff. (fluid systems)
voltage(electrical systems) temp. diff. (thermal systems) |
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mass divided by volume equals
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density
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what measures density or specific gravity in liquids
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hydrometer
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unit of force divided by unit of area equals
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pressure
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manometers measure?
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pressure diff.
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two types of fluids
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hydraulic and pneumatic
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gasses are ______. liquids are ______.
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compressible, not comressible
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pressure increases with depth in a fluid but is independent of ________.
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volume
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absolute pressure?
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vacuum (0 pressure)
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ratio of an objects weight to its volume
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weight density
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voltage comes in two different forms, _____ and _____.
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ac, dc
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voltmeter measures?
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voltage diff.
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multimeter measure?
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voltage, amps, resistance (ohms)
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positive pole or electrode in a battery?
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anode
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electrical circuits contain a?
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source, conductors, load
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temp diff. acts as prime mover in?
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thermal system
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vibrating movement of atoms is also called ?
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heat
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temp. is?
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average energy of motion
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thermocouples measure what ?
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temperature
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the degree symbol is placed after the f or c when giving the?
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temperature diff.
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force times distance equals
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work
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input work
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work going into system
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output work
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work done by system
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efficiency
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output work divided by input work time 100
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spring scale
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used to measure input and output work
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in rotational mechanical systems torque time angle equals
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work
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english unit of work?
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foot-pounds
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si unit of work?
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newton-meter
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linear mechanical work is preformed when a mass is moved in a _______.
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straight line
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angular mechanical work is preformed when a mass is moved ___________.
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around its axis
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mechanical work cause es an object to start _____, stop _____, or change _____.
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moving, moving, direction
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fluid work i equal to
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pressure diff. time volume moved
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to calculate the fluid work you need to know the
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height and weight density of the liquid
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i closed fluid systems the liquid is ______.
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reused
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there is no such thing as linear or angular ________.
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fluid work
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pressure times area equals
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work
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the cross sectional area of a cylinder can be found by multiplying .7854 by the _______.
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diameter squared
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a coulomb is equal to
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6.25 times 10 to the 18th
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amps x time =
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elictrical charge
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electrical work equals
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v*q
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unit of electrical work is?
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joule
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in put work done by a pump or motor will be given in ______.
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joules
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rate is a?
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displacement-like quantity divided by elapsed time
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velocity is the measure of ?
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linear mechanical work
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velocity is vector speed is ______.
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scalar
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units of linear mechanical rate?
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foot per second or meter per second
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angular rate is expressed as?
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radians per seconds
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1 revolution equals
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6.28radians
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stroboscope measure?
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angular rate
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acceleration is?
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rate at which speed increases or decreases
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flow rate is?
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volume of fluid moved in given period of time
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units of fluid flow
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gallons per minute
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thicker fluids have a higher ______.
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viscosity
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under the same _______ a larger pipe will have greater flow rate
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pressure
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electrical rate is the amount of ____________.
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charge moved
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one amp equals
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one coulomb per second
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milliampere is equal to
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1/1000 amps
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one microampere is equal to
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1*10 ^ -6
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ammeter measures?
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current
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hertz is a a measure of what?
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frequency in ac current
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oscilloscope measures two things frequency and ________.
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voltage
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Qh stands for what?
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heat flow rate
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amount of heat transferred is?
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heat flow rate
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unit of heat are
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btu or calorie
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Dewar flask store?
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heat energy
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thermocouple measures?
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heat flow rate
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resistance =
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force divided by rate
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two forms of resistance ?
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friction and drag
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force of friction equals?
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force times coefficient of friction
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force divided by velocity equals?
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resistance
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drag resistance results from the the disruption of ________.
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airflow
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static friction must be overcome to start a object in ________.
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motion
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kinetic friction must be over come to keep an object in _______.
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motion
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static friction is always _______ than kinetic friction
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greater
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friction can be reduced by adding _________.
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lubricants
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boats have what kind of resistance
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fluid resistances
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opposite of turbulence is?
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laminar flow
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fluid resistance is proportional to the ?
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length of pipe
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Rf=
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dp/qv
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delta voltage divided electrical current flow equals
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electrical Resistance
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omega is the symbol for what?
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ohms
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electrical resistance depends on material, length and ______________.
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cross sectional area of wires
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resistor control?
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amount of voltage
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examples of conductors?
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copper, solder, gold, silver
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examples of insulators?
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plastic, ceramic, cork, wood
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materials that let some current to pass through?
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semi cunductors
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material with high resistivity are called?
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insulators
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in a series circuit resistance is found by adding what?
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the resistance values in the circuit
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(R1R2)/(R1+R2)=
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Rtot
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thermal resistance is opposition to flow of ________ through a material
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heat
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Rt=
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DT/Qh
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_________ materials have low conductivity values
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insulators
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r value is also called?
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r factor
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l/ka=
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Rt
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