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73 Cards in this Set
- Front
- Back
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what is the formula for force?
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mass x acceleration
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what is force?
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push or pull that causes a change in shape or motion
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what is torque?
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force like quantity in rotational mechanical systems
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what is a hydrometer used for?
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measure density and specific gravity in liquids
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what are manometers used for?
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measure pressure difference
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How is ablsolute pressure measured?
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in reference to a vacuum
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what are the two forms of current?
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AC DC
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what is weight density of water?
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62.4 lbs per foot cubed
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what is heat?
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form of energy characterized by the vibrating movement of atoms and molecules
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what is weight density?
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ratio of an objects weight to its volume
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what is formula for weight?
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gravity x mass
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when opposing forces are equal they are said to be in a state of what?
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Equilibrium
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what do voltmeters measure?
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voltage difference
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what do multimeters measure?
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voltage amperage and resistance
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what is temperature?
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measure of the average energy of motion of molecules in a substance
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what is formula for work?
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force x distance
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what is input work?
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work going into a system
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what is output work?
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work done by system
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what is efficiency?
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output work divided by input work multiplied by 100
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what do spring scales measure?
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input and output force
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what is english unit of work?
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foot-pound
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what is si unit of work?
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newton meter
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when is linear mechanical work performed?
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when a mass is moved in a straight line
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when is angular mechanical work performed?
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when a mass is moved around an axis or rotation
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what is formula for fluid work?
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pressure difference times the volume moved
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in which system is the fluid reused?
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closed system
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how do u find the cross sectional area of a cylinder?
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.7854 x diameter squared
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when is electrical work done?
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when a voltage move a specified amount of electrical charge
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how can electrical charge be calculated?
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multiplying amperes by time
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what is basic unit of electrical work?
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joule
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when is input work performed?
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by electrical pump
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how do u find work done by a piston?
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pressure exerted by a piston multiplied by area of piston face
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how do u calculate fluid work?
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height a fluid is raised and weight density of fluid
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what is rate?
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displacement-like quantity divided by elapsed time
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what does velocity measure?
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linear mechanical work
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what is english units for linear mechanical rate?
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foot per second
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what is si units for linear mechanical rate?
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meter per second
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what is si units for angular rate?
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radians per second
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what is english unit for angular rate?
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revs per minute
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what is acceleration?
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rate at which speed increases or decreases
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what is si unit for acceleration?
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meter/sec squared
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what is english unit for acceleration?
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meter/sec squared
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what does a stoboscope measure?
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angular rate
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what is flow rate?
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volume of fluid moved in a given period of time
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what is viscosity?
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quality of a substance related to its thickness
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what is the milliampere equal to?
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1/1000 amps
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what is hertz?
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measure of frequency in alternating current
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what is a dewar flask?
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used to contain and store heat energy
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what is equation for resistance?
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force like quantity divided by a rate
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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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what is the opposite of turbulent flow?
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laminar flow
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what is equation for drag resistance?
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force divided by velocity
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what represents electrical resistance?
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RE
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what represents voltage difference?
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DV
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what represents electrical current flow?
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I
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how can friction be reduced?
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adding lubricants
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what does drag resistance result from?
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disruption of air flow
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what are insulaters?
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materials such as plastic that do not permit the free flow of electrons
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what are conductors?
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materials such as copper and solder that permit the free flow of electrons
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what does electrical resistance depend on?
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type of material
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what are semi conductors?
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materials that allow some current to pass through
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what is thermal resistance?
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opposition to the flow of heat through a material
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what is energy?
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ability to do work
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what is potential energy?
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stored in a mechanical fluid
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what represents spring constant?
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k
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what represents force?
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f
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what is the formula for spring constant?
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k=f/d
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what is electical energy?
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energy associatedwith the position or movement of electrical charge
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what is the units for capacitance?
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farads
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what is units for inductance?
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henries
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total energy in a system is equal to what?
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sum of the potential energy and kinetic energy
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gravitational potential energy is what?
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energy that an object has because it has been raised against the gravitational pull of the earth
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