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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 fore-like 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? "Force-like" 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) Foot-pound What is the basic unit of work? (SI) Newton-meter 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 cross-sectional 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 displacement-like 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 semi-conductor? 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 r-value 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