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73 Cards in this Set
 Front
 Back
what is the formula for force?

mass x acceleration


what is force?

push or pull that causes a change in shape or motion


what is torque?

force like quantity in rotational mechanical systems


what is a hydrometer used for?

measure density and specific gravity in liquids


what are manometers used for?

measure pressure difference


How is ablsolute pressure measured?

in reference to a vacuum


what are the two forms of current?

AC DC


what is weight density of water?

62.4 lbs per foot cubed


what is heat?

form of energy characterized by the vibrating movement of atoms and molecules


what is weight density?

ratio of an objects weight to its volume


what is formula for weight?

gravity x mass


when opposing forces are equal they are said to be in a state of what?

Equilibrium


what do voltmeters measure?

voltage difference


what do multimeters measure?

voltage amperage and resistance


what is temperature?

measure of the average energy of motion of molecules in a substance


what is formula for work?

force x distance


what is input work?

work going into a system


what is output work?

work done by system


what is efficiency?

output work divided by input work multiplied by 100


what do spring scales measure?

input and output force


what is english unit of work?

footpound


what is si unit of work?

newton meter


when is linear mechanical work performed?

when a mass is moved in a straight line


when is angular mechanical work performed?

when a mass is moved around an axis or rotation


what is formula for fluid work?

pressure difference times the volume moved


in which system is the fluid reused?

closed system


how do u find the cross sectional area of a cylinder?

.7854 x diameter squared


when is electrical work done?

when a voltage move a specified amount of electrical charge


how can electrical charge be calculated?

multiplying amperes by time


what is basic unit of electrical work?

joule


when is input work performed?

by electrical pump


how do u find work done by a piston?

pressure exerted by a piston multiplied by area of piston face


how do u calculate fluid work?

height a fluid is raised and weight density of fluid


what is rate?

displacementlike quantity divided by elapsed time


what does velocity measure?

linear mechanical work


what is english units for linear mechanical rate?

foot per second


what is si units for linear mechanical rate?

meter per second


what is si units for angular rate?

radians per second


what is english unit for angular rate?

revs per minute


what is acceleration?

rate at which speed increases or decreases


what is si unit for acceleration?

meter/sec squared


what is english unit for acceleration?

meter/sec squared


what does a stoboscope measure?

angular rate


what is flow rate?

volume of fluid moved in a given period of time


what is viscosity?

quality of a substance related to its thickness


what is the milliampere equal to?

1/1000 amps


what is hertz?

measure of frequency in alternating current


what is a dewar flask?

used to contain and store heat energy


what is equation for resistance?

force like quantity divided by a rate


what must be overcome to start an object in motion?

sliding friction


what must be overcome to keep a moving object in motion?

kinetic friction


what is the opposite of turbulent flow?

laminar flow


what is equation for drag resistance?

force divided by velocity


what represents electrical resistance?

RE


what represents voltage difference?

DV


what represents electrical current flow?

I


how can friction be reduced?

adding lubricants


what does drag resistance result from?

disruption of air flow


what are insulaters?

materials such as plastic that do not permit the free flow of electrons


what are conductors?

materials such as copper and solder that permit the free flow of electrons


what does electrical resistance depend on?

type of material


what are semi conductors?

materials that allow some current to pass through


what is thermal resistance?

opposition to the flow of heat through a material


what is energy?

ability to do work


what is potential energy?

stored in a mechanical fluid


what represents spring constant?

k


what represents force?

f


what is the formula for spring constant?

k=f/d


what is electical energy?

energy associatedwith the position or movement of electrical charge


what is the units for capacitance?

farads


what is units for inductance?

henries


total energy in a system is equal to what?

sum of the potential energy and kinetic energy


gravitational potential energy is what?

energy that an object has because it has been raised against the gravitational pull of the earth
