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85 Cards in this Set

  • Front
  • Back
Force equals mass times what?
Accleration
What is a force?
Is a push or pull that causes a change in shape or a change in motion
What is weight density?
Is the ratio of an objects weight to its volume
What is a Hydrometer?
is used to measure density or specific gravity in liquids
What is temperature difference?
acts as a prime mover in thermal mover in thermal systems because heat always moves from warmer regions to cooler regions
What is heat?
Is a form of energy characterized by the vibrating movement of atoms and molecules
What is temperature?
Is the measure of the average energy of motion of moecules in a substance?
What is Thermocouples?
Use three wires of two different metals to measure temperature
What does Multimeters measure?
Measure voltage, amperage, and resistance (in Ohms)
What is an anode?
The positive pole or electrode in a battery.
What is a Cathode?
The negative pole or electrode
What is absolute pressure?
Is measured in reference to a vacuum(Zero Pressure)
What are two types of fluids?
Hydraulic and pneumatic
What is weight?
Is the measurement of gravity times mass
What is torque?
Is the force-like quantity in rotational mechanical systems
______is the work going into a system, preformed by human or a motor
Input Work
______is the work done by the system
Output Work
______is output work divided by inout work, multiplied by 100.
Efficiency
______are used to measure input and output force.
Spring scales
_____is preformed when a mass is moved in a straight line.
Linear Mechanical Work
_____is preformed when a mass is moved around axis or rotation
Angular Mechanical Work
_____causes an object to start moving,stop moving,or change direction.
Mechanical Work
_____is equal to the pressure difference times the difference times the volume moved.
Fluid Work
The cross-sectional area of a cyllinder can be found by multiplying____
.7854 by the diameter squared
___is done when the voltage move a specified amount of electrical charge
Electrical Work
What is the basic english unit of work?
Foot-pound
What is the basic SI unit of work?
Newton-Meter
____is the quantity of charge equal to 6.25 times 10^8 electrons
Coulomb
What is the symbol of coulombs?
q
What is the unit of electrical work?
Joule
What is rate?
is a displacement-like quantity divided by elapsed time
What is Velocity?
Is the measure of linear mechanical work.
What is speed?
Is similar to velocity,but it is a scalar(no directional notation)
What is angular rate?
is expressed in radians per second or revolutions per minute
What many radians are in one revelotion?
6.28
What is accleration?
is the rate at which speed increases or decreases.
What are the units of accleration?
foot/second^2 and meters/second^2
What is flow rate?
is the volume of fluid moved in a given period of time
What is the symbol for volume flow rate?
Qv
What is Viscosity?
is the quality of a substance related to its thickness
What is electrical rate?
is the amout of charge moved in a given eriod of time
What is an Oscilloscope?
can measure frequency as well as voltage waveform
What is the symbol of heat flow rate?
Qh
What is dewer flask?
is used to contain and store heat energy
What can a thermocouple thermometer be used to measure?
heat flow rate
Whats the equation for resistance?
resistance equals a force like quantity divided by a rate
What are two forms of resistance in mechanical system?
friction and drag
What is kinetic friction?
must overcome to keep a moving object in motion
What is static friction?
must overcome to start a object in motion
What is ohm's law?
is the standard equation for calculating eletrical resistance
What are resistors?
are used to control the amount of voltage in a circuit
What are conductors?
are materials such as copper and solder that permit the free floe of electrons
What are insulators?
are materials such as plastic and ceramic that do not permitthe free flow of electrons
What are semi conductors?
are materials such as silicon that allows some current to pass through
What is resistivity?
is the quality of a material that describes how much its permits electricity to flow through it
Waht is thermal resistance?
is opposition to the flow of heat through a material
What is the equation for thermal resistance?
Rt=DT/Qh
What is thermal conductivity?
is the quality of a material that describes how well its transmits heat
What is the R-Value?
is the rating based on its ability to resist heat flow
What is the fromula for calculating thermal resistance?
Rt=l/kA
What is energy?
is the ability to do work
What is potential energy?
is energy stored in a mechanical,fluid,or electrical device by virtue of a change in shape or position
What is the formula for potential energy?
Ep=force x height
What is gravitational potential energy?
is energy that an object has because it has bee raised against the gravitational pull of the Earth.
What is Elastic potential energy?
is energy that has an object has been temporarily changed
What is kinetic energy?
is the energy of motion possessed by a moving body
What is moment of inertia?
is the quantity that acts like a masss in rotational mechanical systems
What is electrical energy?
is the potential energy and kinetic energy that are associated with the position or movement of electrical charge
What is capacitors?
are electronic devices consisting of conductors seperated by insulators
What is capacitance?
is measured in farads and is calculated by the formula C=q/V
What is inductors?
are electronic devices that consist of a coil of wire wrapped around a core
What are the units of energy?
Calories and Btu
What is conduction?
is the movement of heat energy from warmer regions to cooler regions
What is convection?
is the transfer of heat energy by a movement of a flud medium from one region to another
What is radiation?
is the transfer of heat energy by electromagnetic radiation
What is power?
is the rate of doing work
What is the equation for power?
P=work/time
What is the english units for power?
foot-pounds/second
What is the SI units for power?
watts
One watt equals to_______
one joule per second
One horsepower equals to_______-
550 foot-pounds/second
One horsepower equals____
746 watts
What is kilowatt-hour?
is a unit of energy
One watt equals_____
one volt times ne amp
In rotational mechanical systems,power equal torque times______
Angular rate