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50 Cards in this Set
- Front
- Back
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Force
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equals mass times acceleration
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a force
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is a push or pull that causes a change in shape or a change in motion
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weight
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is the measurement of gravity times mass
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torque
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is the force it is measured in newtons and pounds
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density
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is the found by dividing mass by volume
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2 type of fluid
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hydraulic and pneumatic
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weight density
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is the ratio of anobject weight to its volume.
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absolute pressure
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is the measured in reference to a vacuum
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voltage
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comes in 2 forms direct current and alternating current
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voltmeters
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measured voltage difference
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anode
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the positive pole or electrode in a battery
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temperature difference
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acts as a prime mover in termal systems bc heat always moves from warmer region to cooler regions.
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heat
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is a form of energy characterized by the vibrating movement of atoms and molecules
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work
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equals force times distance
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input
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is the work going into a system oerformed by a human or a motor
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output
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is the work done by the system
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efficiency
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is output divided by input work multplied by 100
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rotational mechanical system
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work is equal to torque multipled by the angle
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linear mechanical work
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is performed when a mass is moved in a straight line
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angular mechanical work
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isperformed when a mass is moved around an axis or rotation
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weight density
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of the fluid in order to calculate fluid work
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cross sectional of cylinder
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can be found by multiplying 0.7854
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joule
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basic unit of electrical work
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input work
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oerformed by an electrical pump or motor given in joules
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rate
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is a displacement like quantity divided by elapsed time
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velocity
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is the measure of linear mechanical work
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speed
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is similar to velocity but it is scalar
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revolution
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there are 6.28 radians in one revolution
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acceleration
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is the rate at which wpeed increases or decreases
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fluid system
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is the volume of fluid moved in a given period of time
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viscosity
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is the quality of a substance related to its thickness
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electrical rate
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is the amount of charge moved
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electrical current
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flow is sysmbolzed by an T
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hertz
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is a measure of frequency in alternation current
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oscilloscope
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can measure frequency as well as voltage waveform
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equation for resistance
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resistance equals a force like quanity divided by a rate
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2 forms of resistance
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friction and drag
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drag resistance
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results from the disruption of air flow as an object
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sliding friction
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must be overcome to state an object
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kinetic friction
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must be overcome to keep a moving object in motion
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static friction
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is always greater than kinetic friction
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friction
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can be reduced by the addition of lubricants
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ohms law
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is the standard equation for calculating electrical resistance
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electrical resistance
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is equal to voltage difference divided by electrical current flow
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conductors
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are materials such as copper and solder that permit the free flow of electrons
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insulators
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are materials such as plastic and ceramic that do not permit the free flow of electrons
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R-value
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is the rating of a material based on its ability to resist heat flow
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energy
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is the ability to do work
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potential energy
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is energy is the enregy stored in a mechanical fluid or electrical device by virtur of a chane
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gravitationa; potential energy
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is energy that an object has because it has been raised against the gravitational pull of the earth.
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