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143 Cards in this Set
- Front
- Back
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force
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mass times acceleration
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a _______ is a push or pull
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force
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what is the total amount of matter in an object?
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mass
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wieght is a measurment of gravity times _____
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mass
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torque is a forcelike quantntity in a _______ mechanical system
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rotational
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net force is
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the sum of the two forces acting twards the same
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what is a prime mover?
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preasure difforence
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density
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mass devided by voulume
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a ________ is used to measure density or specific gravity
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hydrometer
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preasure
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deviding a unit of force bt a unit of area
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_______ are us4ed to measure tempature difforences
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manometers
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two types of fluids are
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pnuematic and hydralic
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gasses are compressible, liquids are____ compressible
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not
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preasure increases with dept in a fluid but is __________ of volume
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independent
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absolute preasure is
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measured in reference to a vaccume
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weight density
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ratio of an oject weight to its volume
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voltage has two forms which are
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DC AC
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voltmeters measure
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voltage difforence
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multimeters measure
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voltage, amperes, and resistance
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the positive pole of electrode in a batterie is called the
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anode
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electrical circuits contain
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source conductor a load switch
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electrical circuits contain
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source conductor a load switch
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tempature difforence acts as a
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prime mover in thermal systems
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tempature difforence acts as a
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prime mover in thermal systems
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vibrating movements of atoms and molecules
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heat
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vibrating movements of atoms and molecules
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heat
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tempature
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measure of tha average energy of mothion
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tempature
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measure of tha average energy of mothion
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thermocouples
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use difforent metals to measure tempature
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thermocouples
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use difforent metals to measure tempature
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the degree symbol is placed after of the F or C when its
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a difforence
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the degree symbol is placed after of the F or C when its
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a difforence
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work
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force times distance
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work
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force times distance
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work going into a system is
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input work
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output work is work
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done by the system
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work going into a system is
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input work
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output work is work
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done by the system
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efficiantcy
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output work devided by input work times 100
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efficiantcy
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output work devided by input work times 100
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sping scales measure
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input and output forces
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in rotational mechanical systems work is done by
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work multiplied by the angle at wich the lever arm moves
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the basic english unit for work
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is the foot pound
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the basic si unit for work is the
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newton meter of joule
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linear mechanical work is done when
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mass is moved in a straight line
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angular mechanical work is perforeed when
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mass is moved round an axis or rotation
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mechanical work causes an object to
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start moving or stop
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fluid work
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preasure dif times voulume moved
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when given a height the fluid was raised youmust also know the
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weight density
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in a closed fliud system
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the fluid is reused
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there is no sich thing as linear or angular
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fluid work
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the presure exerted by a piston multiplied by the area of a piston
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work done by the sytem
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the cross sectional of a cylander can be found y multiplying
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0.7854 by the diameter
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electrical work is done when
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a voltage moves a certain amount of electrical charge
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a coulumb is a qauntity charge equal to
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6.25 times ten to the 18
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electrical charge
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ampers times time
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basic unit for electrical work
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joule
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input work performed by an electrical pump or motor will be given in
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joules
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rate
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displacement like quantity devided by elapsed time
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velocity is the measure of
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linear mechanical work
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speed is simular to velocity but without
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schalr
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units of linear mechanical rate
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foot per sec and meter per sec
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angular rate is expressed in
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radions per seconds or revolutions per second
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how many radions are in one revolution?
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6.28
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what is a stroboscope?
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measures angular rate
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acceleration is
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the rate at wich something increases
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flow rate is the
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voulume of fluid moved at any given period of time
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what are the units for fluid flow?
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galllons per min
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viscosity
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qaulity of a substance to its thickness
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larger pipes have a
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higher flow rate than smaller pipes
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electrical flow rate is
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the amount of currents flowed in a period of time
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one milliampre is
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1/1000amps
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micro ampre
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.000001 of an amp
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ammeter is used to
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measure current
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hertz is a
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measure of freaquency
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oscilloscope can measure
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freaquency
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heat flow rate is symolized by
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Qh
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heat flow rate is the amount of
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heat energy transferred in a period of time
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what are some units of heat?
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BTU
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what si a dewar flask for?
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to contain and store heat energy
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thermocouple is used to
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measure heat flow rate
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resistance
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force devided by rate
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two forms of resistance is
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friction and drag
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drag resistance
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resistance equls force devided by velocity
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where does drag resistance come from?
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the disruption of airflow
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what must bne overcome to start an object to move?
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sliding friction
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what must be overcome to keep an objet in motion?
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kenetic friction
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static friction is always greater than
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kenetic friction
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friction can be reduced ny the use of lu
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lubricants
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resistance created by a solid moving through a liwuid is called
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fluid resistance
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laminar is
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the opposite of turbulent flow
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fluid resistance is porportional to
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the length of the pipe
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fluid resistance
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Rf Dp/Qv
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electical resistance is
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Dv/I
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ohms law is the
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standard calculating procedure to find electrical resistance
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electrical resistance happens when
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electrons run into meatl atoms of the wire
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are used to controle the amount of
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voltage in a system
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conductors permit the
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free flow of electricity
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insulators arre materials that
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stop the free flow of electricity
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semi conductors are
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materials that alow some current to pass through
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resistivity is the
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amount of electricity thats let through
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total resistance is found by
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adding tha resistance values in the circut
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in a parralell circut total resistance is found by (R1=R2)(
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(R1=R2)(
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thermal resistance is the
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opposition to the flow of heat through a metal
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thermal conductivity
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DT/Qh
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thermal conductivity is cow well an object
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conducts heat
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R value is the
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abality to resist heat flow
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thermal resistance
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I/KA
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energy is tha ability to
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do work
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energy is used to overcumb
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resistance in the system
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potential energy is
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stored energy
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potential enrgy
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force times hieght
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gravitational potential energy is the energy that
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is raised agaisnt the pull of the earth
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elastic potential energy
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is elastical enery waiting to get let off
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a spring constant
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force over distance
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potential energy thats stored by a compressed spring is
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Kd^2
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potential energy of water sored is calculated by
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wieght of water times hieght
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kenetic energy is the
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energy of motion
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kenetic energy is
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1/2mv^2
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moment of enertia
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quantity that akts like a mass
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totaql enrgy is
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the sum of potential energy
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electrical energy is
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energy held by electricity
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capacitors are devises of
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conductors and insulators
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capacitance is measured in
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farads
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inductors
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store energy
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inductance is measured in
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henries
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thernmal energy is conected to heat because
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work is done with heat
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heat
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mcdt
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mechanical equivilent of heat
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no freaking clue what that means
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units of energy
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BTU Calories
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latent is heat is
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heat added or subtracted
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conduction is
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vibration of molecules
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convection is
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transfer of heat energy
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radiation is
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transfer of heat through electromagnetic radiation
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power is the
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rate of doing work
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power
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work over time
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power is meaured in
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foot pounds
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one wat is equal to
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one joule
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one horsepower is equal to
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550 foot pound per sec
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one horsepower is equal to
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746 watts
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killawatt-hour
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is a unit of energy not power
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in rotational systems power is
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toruqe
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in fluid systems power is
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preasure difforence times flow rate
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