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109 Cards in this Set
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What is the formula for force?

Force=Mass x Acceleration


What is force?

A push or pull that causes a change in shape or a change in motion


What is mass?

The total amount of matter in an object


What is weight?

The measurement of gravity times mass


What is torque?

The forelike quantity in rotational mechanical systems


What is net force?

When 2 objects' forces are added up when they are acting in the same direction


What are prime movers?

"Forcelike" quantities that act in the same way as a force does in a mechanical system


What is density?

Mass/Volume


What does a hydrometer do?

It measures density or specific gravity in liquids


What is pressure?

Unit of force/Unit of area, units include psi, g/cm^2, and kg/m^2


What do manometers do?

They measure pressure differences


What are the 2 types of fluid systems?

Hydraulic and pneumatic


Gasses are _____________

Compressible


________ increases with depth in a fluid

Pressure


What is absolute pressure?

the measured in reference to a vaccum (zero pressure)


What is weight density?

The ratio of an object's weight to its volume


What is voltage?

Comes in 2 forms, AC and DC, is a prime mover


What do voltmeters measure?

Voltage difference


What do multimeters measure?

Voltage, amperage, and resistance


What is the positive pole on a battery called?

Anode


What makes up an electrical circuit?

Source, conductors, a load, and a control element


What is temperature difference?

A prime mover in thermal systems because heat always moves from hot to cold areas


How is heat characterized?

By the vibrating movement of atoms and molecules


__________ is the average energy of motion of molecules in a substance

Temperature


What are thermocouples?

3 wires of 2 different metals to measure temperature


Where is the degree symbol placed if a number is a temp. difference?

Before the number


____ = Force x Distance

Work


Input work is _____________

the work going into a system


Output work is _______________

the work that the system puts out


What is the formula for efficiency?

Wo/Wi x 100%


Spring scales measure ____________

Input and output work


In rotational mechanical systems, work is equal to lever arm x _______

Torque


What is the basic unit of work? (English)

Footpound


What is the basic unit of work? (SI)

Newtonmeter


How is linear mechanical work done?

When mass is moved in a straight line


How is angular mechanical work done?

When mass is moved around an axis


What can mechanical work do?

Start moving, stop moving, or change the direction of an object


What is the formula to find fluid work?

W=p x DV


If you know weight density, what else must you know to solve for fluid work?

The height of the fluid


In a closed fluid system, fluid is _____

Reused


There is no such thing as _______ or _______

Linear or angular fluid work


Pressure exerted by a piston times the area of the piston face equals the ____ done by the piston

Work


The crosssectional area of a cylinder can be found by multiplying _______ by the diameter^2

0.7854


What is the formula for electrical work?

EW=V x q


A coulomb is equal to __________ electrons

6.25 x 10^18


How can you calculate electrical charge?

Amperes x time


What is the basic unit of electrical work?

Joules


Input work preformed by an electrical pump or motor will be given in _____.

Joules


What is a rate?

A displacementlike quantity divided by elapsed time


What is velocity measure as?

Linear mechanical work


Speed is similar to _______

Velocity


What are the units of linear mechanical rate?

foot per second and meter per second


How is angular rate expressed?

radians per second and revolutions per minute


How many radians are in one revolution?

6.28 radians


What is a stroboscope?

A tool that measures angular rate.


What is the definition of acceleration?

A rate at which speed increases or decreases.


What is the symbol for volume flow rate?

Qv


What are the units of fluid flow?

Gallons/minutes, cubic feet/second, and cubic meters per second.


What is viscosity?

The quality of a substance related to its thickness.


How does the flow rate of a big pipe compare to that of a little pipe under the same pressure?

The big pipe has a higher flow rate


What is electrical rate?

The amount of charge moved in a given period of time


What is electrical rate measured in?

Amperes


One milliampere in equal to ________

1/1000 amps


How many radians are in one revolution?

6.28 radians


What is a stroboscope?

A tool that measures angular rate.


What is the definition of acceleration?

A rate at which speed increases or decreases.


What is the symbol for volume flow rate?

Qv


What are the units of fluid flow?

Gallons/minutes, cubic feet/second, and cubic meters per second.


What is viscosity?

The quality of a substance related to its thickness.


How does the flow rate of a big pipe compare to that of a little pipe under the same pressure?

The big pipe has a higher flow rate


What is electrical rate?

The amount of charge moved in a given period of time


What is electrical rate measured in?

Amperes


One milliampere in equal to ________

1/1000 amps


How many radians are in one revolution?

6.28 radians


What is a stroboscope?

A tool that measures angular rate.


What is the definition of acceleration?

A rate at which speed increases or decreases.


What is the symbol for volume flow rate?

Qv


What are the units of fluid flow?

Gallons/minutes, cubic feet/second, and cubic meters per second.


What is viscosity?

The quality of a substance related to its thickness.


How does the flow rate of a big pipe compare to that of a little pipe under the same pressure?

The big pipe has a higher flow rate


What is electrical rate?

The amount of charge moved in a given period of time


What is electrical rate measured in?

Amperes


One milliampere in equal to ________

1/1000 amps


What is the purpose of a dewer flask?

To contain and store heat energy


What can a thermocouple thermometer do?

Measure heat flow rate


What is the unifying equation for resistance?

Resistance = force / rate


What are the 2 forms of resistance in a mechanical system?

Friction and drag


What is the equation for the force of friction?

Force of friction = force x coefficient of friction


What is the equation of drag resistance?

resistance = force / velocity


What must be overcome to start an object in motion?

Sliding friction


What must be overcome to keep and object in motion?

Kinetic friction


Static friction is always _______ than kinetic friction

greater


What can help reduce friction?

Lubricants


What is laminar flow?

The opposite of turbulent flow


What is the formula for fluid resistance?

Rf = Dp / Qv


What is the formula for electrical resistance?

Re = DV / I


What are resistors used for?

They control amounts of voltage in a circuit


What are some good conductors?

Copper and solder


What are some good insulators?

Plastic and ceramic


What is an example of a semiconductor?

Silicon


What is resistivity?

The quality of material that describes how much it permits electricity to flow through it


What is thermal resistance?

The opposition to the flow of heat through a material


Thermal resistance equation

Rt = DT / Qh


What is the rvalue of something?

How well is can resist heat flow


What is energy?

The ability to do work


What is potential energy?

Stored energy


What is the formula for pot energy?

Ep = Force x Height


What is gravitational potential energy?

The energy an object has because it has been raised against the gravitational pull of Earth


What is elastic potential energy?

Energy the object has because its shape has been temporarily changed
