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74 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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_____ is the total amount of matter in an object.
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Mass
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_____ is the measurement of gravity times mass.
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Weight
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_____ is the force-like quantity in rotational mechanical systems.
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Torque
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When forces act in the same direction, the _____ _____ is the sum of the two forces.
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net force
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What are the prime movers?
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pressure difference, voltage, and temperature difference
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Density
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mass divided by volume
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A _____ is used to measure density or specific gravity in liquids.
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hydrometer
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Pressure
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a unit of force divided by a unit of area
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_____ are used to measure differences.
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manometers
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What are the two types of fluids?
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hydraulic, pneumatic
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____ are compressible, ____ are not compressible
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gasses, liquids
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Pressure ____ with depth in a fluid
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increases
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_____ _____ is measured in reference to a vacuum.
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absolute pressure
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_____ is the ratio of an object's weight to it's volume
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Weight density
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Voltage comes in what two forms?
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DC and AC
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_____ measure voltage difference
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voltmeters
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_____ measure voltage, amperage, and resistance.
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multimeters
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The positive pole in a battery is the ____
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anode
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Temp difference acts as a prime mover why?
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heat always moves from warmer region to cooler regions
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What is heat?
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a form of energy characterized by the vibrating movement of atoms and molecules
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_____ is the measure of the average energy of motion of molecules in a substance.
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temperature
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_____ use three wires of two different metals to measure temperature.
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Thermocouples
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The degree is placed _____ of the F or C when giving a temp.
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in front
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Work
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force times distance
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____ ____ is the work going into a system, performed by a human or a motor.
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Input work
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____ ____ is the work done by the system.
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Output work
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Efficiency
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output work divided by input work, multiplied by 100
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____ ____ measure input and output force
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Spring scales
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Work
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force times distance
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____ ____ is the work going into a system, performed by a human or a motor.
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Input work
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____ ____ is the work done by the system.
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Output work
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Efficiency
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output work divided by input work, multiplied by 100
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____ ____ measure input and output force
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Spring scales
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Rotational Mechanical Systems work
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torque times the angle which the lever arms moves
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What is the English unit of work?
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foot-pound
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What is the SI unit of work?
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newton-meter
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____ ____ ____ is performed when a mass is moved in a straight line.
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Linear mechanical work
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____ ____ ____ is performed when a mass is moved around an axis or rotation
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Angular mechanical work
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____ ____ causes an object to start moving, stop moving, or change direction
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Mechanical work
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____ ____ Is equal to the pressure difference times the volume moved
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Fluid work
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What must you know to calculate the fluid work
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weight density
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In a ____ fluid system, the fluid is reused
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closed
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There is no such thing as ____ or ____ fluid work
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linear or angular
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Work done by piston
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Pressure exerted by piston multiplied by the area of the piston face equals the work done by the piston
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The cross-sectional area of a cylinder
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multiply .7854 by the diameter
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____ ____ is done when a voltage move a specified amount of electrical charge
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electrical work
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Coulomb
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a quantity of charge equal to 6.25 times 10^18 electrons
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Electrical charge
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amperes x time
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What is the unit of 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 divided by elapsed time
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____ is the measure of linear mechanical work
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velocity
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Speed is ____
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scalar
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Units of linear mechanical rate
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foot per second, meter per second
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Units of angular rate
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radians per second, revolutions per second
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there are ____ in one revolution
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6.28
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a ____ is used to measure angular rate
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stroboscope
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____ is the rate at which speed increases or decreases
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acceleration
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In fluid systems, ____ ____ is the volume of fluid moved in a given period of time
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flow rate
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Units of fluid flow
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gallons/minute, cubic feet/second, cubic meters per second
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____ is the quality of a substance related to its thickness
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viscosity
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A larger pipe will have a ____ flow rate than a smaller pipe.
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higher
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____ ____ is the amount of charge moved
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electrical rate
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one ampere is equal to ____ coulomb per second
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one
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One ____ is equal to 1/1000 amps (or .001 amps)
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milliampere
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One ____ is equal to 1 x 10^-6
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microampere
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An ____ is used to measure current
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anmeter
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____ is a measure of frequency in alternating current
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hertz
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An ____ can measure frequency as well as voltage waveform
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oscilloscope
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____ ____ ____ is symbolized by QH
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heat flow rate
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____ ____ ____ is the amount of heat energy transferred through a substance in a unit of time.
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Heat flow rate
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Units of heat
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btu, calorie
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