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55 Cards in this Set
- Front
- Back
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Force equals what?
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Mass times acceleration.
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What is a force?
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A push or a pull.
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What is mass?
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The total amount of matter in an object.
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Weight equals what?
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Gravity times mass.
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What is torque?
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A force-like quanity in rotational mechanical systems.
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What is Equilibrium?
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When two opposing forces are equal.
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Density equals what?
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Mass divided by volume.
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What is a hydrometer used for?
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Used to measure density or specific gravity.
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Pressure equals what?
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Force divided by area.
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What is a manometer used for?
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To measure pressure differences.
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What are two types of fluids?
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pneumatic (using air) and hydraulic (using liquid).
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True or False: Liquids are compressible.
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False, only gases are compressible.
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What is Gage pressure measured relative to?
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Atmospheric pressure.
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What is Weight Density?
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The ratio of an objects weight to its volume.
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What are the two forms of electricity?
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DC (direct current) and AC (alternating current).
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AC current can be measured in what units?
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hertz.
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what are voltmeters used for?
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To measure voltage difference.
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What is the positive pole on a battery called?
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An anode.
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What is the negative pole on a battery called?
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A cathode.
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What does temperature difference do in thermal systems?
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Acts as a prime mover.
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What is heat?
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A form of energy characterized by the vibrating movement of atoms and molecules.
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What is temperature?
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The measurement of the average energy of motion of molecules in a substance.
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What does a thermocouple do?
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measure temperature using three wires with two different types of metals to measure temperture.
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What does Work equal?
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Force times distance.
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What is Input work?
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work going INTO a system, by a human or machine.
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What is Output work?
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The work done by the system.
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What is the formula for Efficiency?
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Output work divided by Input work, times 100 percent.
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What do Spring Scales do?
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They measure Input and Output work.
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What is the basic English unit for work?
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A foot-pound.
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What is the basic SI unit for work?
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A newton-meter.
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What is linear mechanical work?
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When a mass is moved in a straight line.
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True or False: A cars breaking system is an open system.
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False, the fluid is reused, making it a closed system.
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Explain linear and angular liquid work.
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There is no such thing as liquid work.
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How do you find the cross-sectional area of a cylinder?
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Multiply 0.7854 by the diameter squared.
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What is the charge of one coulomb?
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6.25 times 10 to the 18th electrons.
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What does Mechanical work do?
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Causes an object to start moving, start moving, or change direction.
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What is the fluid work formula?
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W=Dp*V
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How do you find electrical charge?
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Multiplying amps by time.
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What is the basic unit of electrical work?
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A joule.
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What is rate?
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A displacement-like quantity divided by elapsed time.
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What is velocity?
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The measure of linear mechanical work.
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Speed is similar to velocity, why?
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Speed is scalar (no directional rotation)
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how many radians are in a revolution?
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6.28 radians.
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What do stroboscopes measure?
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Angular rate.
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What is acceleration?
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The rate at which an object increases or decreases in speed.
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What letters symbolize flow rate?
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Qv
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What is viscosity?
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The quality of a substance related to its thickness.
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True or False: A larger pipe will have a higher flow-rate than a smaller pipe.
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True.
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What is Electrical rate?
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The amount of charge moved.
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What is the most streamlined shape?
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The teardrop.
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What is a Dewar flask used for?
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To contain and store heat energy.
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What reduces friction?
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Lubrication.
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Laminar flow is opposite of what?
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Turbulent flow.
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What does Ohms law calculate?
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Electrical resistance.
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What are resistors used for?
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To control the amount of of voltage in a circuit.
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