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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
