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73 Cards in this Set
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 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
