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90 Cards in this Set
- Front
- Back
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force =
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mass times acceleration
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mass is the total amount of what in an object?
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matter
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weight is what?
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measurement of gravity times mass
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what is force?
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a push or pull
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torque is what in rotational mechanical systems?
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force like quantity
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what is torque measured in?
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n*m and lb*ft
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voltmeters measure what?
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voltage difference
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Heat is a form of what?
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energy
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gasses are what?
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compressible
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liquids are not what?
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compressible
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what does a hydrometer measure?
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density or specific gravity in liquids
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manometers measure what?
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pressure differences
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hydraulics use what?
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liquid
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pnuematic uses what?
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gas
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what is the units of specific gravity?
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there are none
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work=
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force times distance
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input work is performed by what?
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a human or motor
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output work is done by what?
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the system
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efficiency is?
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output work divided by input work multiplied by 100
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spring scales are used to measure what?
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input and output force
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what is the basic english unit of work?
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foot-pound
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what is the basic SI unit of work?
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newton-meter
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1 joule=
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1 n*m or 1 volt * coulomb
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coulombs are symbolized by what letter?
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q
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what is the basic unit of electrical work?
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joule
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how is cross sectional area of a cylinder found?
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by multiplying .7854 by the diameter^2
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In a closed fluid system such as a hydraulic brake system, the fluid is?
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reused
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Fluid work is = to?
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pressure difference * volume moved
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a coulomb is a quantity of charge equal to?
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6.25*10^18 electrons
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there is no such thing as linear or angular what?
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fluid work
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rate is = to?
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a displacement like quantity divided by elapsed time
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velocity is the measure of what?
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linear mechanical work
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velocity is a what?
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vector
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speed is what?
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scalar
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there are how many radians in one revolution?
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6.28
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a stroboscope is used to measure what?
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angular rate
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acceleration is the rate at which speed what?
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increases or decreases
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slowing down is technically what?
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deceleration
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In fluid systems, what is the volume of fluid moved in a given period of time?
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flow rate
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what is the quality of a substance related to its thickness?
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viscosity
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one milliampere is = to?
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1/1000 amps
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one microampere is = to?
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.000001 amps
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an ammeter is used to measure what?
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current
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Hertz is a measure of what?
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frequency in alternating currents
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an oscilloscope can measure what?
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frequency and voltage waveform
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resistance is = to?
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force like quantity divided by rate
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the 2 forms of resistance in mechanical systems is what?
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friction and drag
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drag resistance =?
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force divided by velocity
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what must be overcome to start an object in motion?
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sliding friction
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what must be overcome to keep a moving object in motion?
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kinetic friction
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Static friction is always greater than what?
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kinetic friction
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friction can be reduced by the addition of what?
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lubricants
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laminar flow is the opposite of what?
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turbulent flow
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fluid resistance = what?
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dp/qv
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what is an example of a conductor?
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copper
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what is an example of an insulator?
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plastic
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what is the unit of resistance?
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ohms
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what is the unit of resistance symbolized by?
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the greek letter omega
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thermal resistance =?
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dt/qh
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what is an example of a semi-conductor?
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silicon
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what is energy?
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the ability to do work
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energy used to overcome resistance in a system is lost in the form of what?
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heat
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potential energy=?
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force * height
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what is energy that an object has because it has been raised against the gravitational pull of the earth?
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gravitational potential energy
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what does k stand for?
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spring constant
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what does weight density =?
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62.4lb/ft^3
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what is the energy of motion possessed by a moving body?
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kinetic energy
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what does i stand for in the formula for kinetic energy in rotational systems?
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moment of inertia
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what is angular velocity usually given in?
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rads/sec
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what is capacitance measured in?
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farads
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what is inductance measured in?
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henries
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what is the units of current?
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amps
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how is heat calculated?
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h=mcDT
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what does c stand for in the heat formula?
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specific heat
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cals and btus are units of what?
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energy
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power is what?
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the rate of doing work
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what is the unifying equation for power?
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work/time
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what can power also be expressed as?
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force*rate
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what is the english unit of power?
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ft-lbs/sec and horsepower
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what is the SI unit of power?
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watts
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one watt is = to what
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one joule per second
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one horsepower is = to?
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550 ft-lbs/sec
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one horsepower also equals what?
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746 watts
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what is an unit of energy that is not power?
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kilowatt-hour
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one watt= what?
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one volt times one amp
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p=?
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v*i
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power can also =?
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one volt times one coulomb divided by one second
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in rotational mechanical systems, power equals?
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torque times angular rate
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in fluid systems, power equals?
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pressure difference times flow rate
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what is the curved w symbol equal in rotational mechanical systems?
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angular rate
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