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90 Cards in this Set
- Front
- Back
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Force =
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mass X acceleration
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A force is...
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a push or pull that causes a change in shape or motion.
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Mass is...
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the total amount of matter in a object.
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Weight is the measure of...
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Gravity X Mass
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Weight is a...
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Force
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Weight is measured in ...
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Newtons(SI) and pouonds(English)
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Torque..
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A force-like quantity in rotational mechanical systems.
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Troque =
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Force X Legnth of lever arm
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Torque is measured in...
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N*m (SI) and Pound*feet(English)
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Net force is...
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the sum of two forces.
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Equilibrium
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when opposing forces are equal.
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Prime Movers (examples)
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pressure difference, voltage, and temperature difference
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Density=
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Mass / Volume
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Specific Gravity =
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Density of given substance / Density of water
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Specific Gravity has no ______
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units.
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Work=
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Force X Distance
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Input work
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work going into a system, performed by human or motor
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Output Work
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the work done by the system
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Efficiency=
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Output work / Input work X 100
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Efficiency ______ exceed 100%.
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cannot
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What are spring scales used for?
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to measure input and output force
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In rotational mechanical systems, Work=
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Torque X Angle of which lever arm moves
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Theta
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the symbol used to symbolize the angle of movement.
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English unit of work
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foot-pound
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SI unit of work
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Newton-Meter
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Linear Mechanical Work
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when mass is moved in a straight line
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Angular Mechanical Work
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when a mass is moved around a axis or rotation
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Mechanical Work
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causing a object to start moving, stop moving, and/or change direction.
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Fluid Work=
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Pressure Diff. X Volume Moved
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Fluid is ____ in a hydraulic brake system
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reused
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rate=
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displacement / elapsed time
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velocity
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measure of linear work
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velocity is a ___while speed is ____.
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vector, scalar
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vector
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something that is moving is accompanied by a direction
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True or False: Speed is the same thing as velocity.
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False. they are similar but not the same.
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Units of Linear Mechanical Rate
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Foot per second (English) Meter per second (SI)
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Angular rate is expressed in
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radians per second (SI) and revolutions per minute (English)
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how many radians are in one revolution?
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6.28
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how many degress are in one revolution?
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360
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a ______ is used to measure angular rate.
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stroboscope
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Acceleration
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the rate at which something increases or decreases in speed.
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units of acceleration
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foot / second^2(English) and meter/second ^2
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what is the term for slowing down?
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decelleration
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_______ is the volume of fluid moved in a given period of time
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flow rate
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what letters represent volume flow rate?
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Qv
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Resistance=
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Force / Rate
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Two forms of resistance in mechanical systems
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friction and drag
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Force or Friction=
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Force X coefficient of friction
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Symbol used to represent coefficient of friction..
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mew
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Resistance =
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Force/ Velocity
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turbulence
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disruption of airflow as an object moves
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streamlining _____ turbulence
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reduces
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most streamlined shape
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teardrop
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Sliding friction
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must be overcome to start an object in motion
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kinetic friction
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must be overcome to keep a moving object in motion
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fluid resistance
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resistance generated by a slid moving through a liquid
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laminar flow is the _____ of turbulent flow
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opposite
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in laminar flow fluid moves _____ object in ______
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around, layers
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fluid resistance is ____ to the _____ of pipe
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proportional, legnth
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Rf=
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Dp/Qv
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What is energy?
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the ability to do work
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what is potential energy?
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energy stored in a mechanical, fluid, or electrical device.
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formula for poential energy..
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Ep= force * height
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formula for spring constant
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k=f/d
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what is elastic potential energy?
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energy an object has because its shae has been temporarily canged
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moment of inertia
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quantity that acts as a mass in rotational mechanical systems
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formula for kinetic energy in a rotational mechanical system
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ek=Iw^2
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Etot=
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Ep+Ek
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what is a capacitor
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used to store electrical charge (potential energy)
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what is capacitane measured in?
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farads
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formula for cpacitance
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C=q/V
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what is a inductor
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stores electrical energy and to oppose changes in current
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what is inductance measured in
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henries
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formula for inductance
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Ep=1/2LI^2
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what is radiation?
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transfer of heat by electromagnetic radiation.
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what is power
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the rate of doing work
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equation for power
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P=work/time
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secondry equation for power
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P=Force*Rate
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what are the units for power in english
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foot-pounds/second or horsepower
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what are the units for power in SI
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watts
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1watt=
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1joule/sec
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1horsepower=
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550 foot-pounds/sec
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1horsepower=
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746watts
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the kilowatt is a unit of _____ no power
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energy
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formula for power in rotational mechanical systems
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P=T*w
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formula for power in fluid systems
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P=DP*Qv
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using the formula for pwer in a fluid system how do you find fluid flow rate
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Qv=P/DP
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using he secondary equation for power how do you find rate
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Rate=P/Force
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using the unifying equation for power how do you find time
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Time=Work*P
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using the equation for power in rotational mechanical systems how do you find torque
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Torque=P/w
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