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93 Cards in this Set
- Front
- Back
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what does force equal?
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mass x acceleration
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what is force?
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force is a push or pull that causes a change in shape or a change in motion
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what is the measurement of what?
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gravity x mass
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gravity on earth is equal to what?
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9.8 meters/second²
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what is torque?
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force like quantity in rotational mechanical systems
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torque is measured in what
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newton x meters or pound x feet
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net force is what
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net force is the sum of to forces
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when opposing forces are equal it is called what
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equilibrium
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what are the primary movers in a in other systems
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pressure difference(fluid system)
voltage(electrical system) temperature difference |
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how do you find density
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density = mass/volume
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what is a hydrometer used for
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measure density or specific gravity in liquids
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how do you measure pressure
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by dividing a unit of force by a unit of area
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what are manometers used for
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they are used for measuring pressure differences
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what are the 2 types of fluid systems
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hydraulic and pneumatic
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gasses are what
liquids are what |
compressible
not compressible |
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pressure increases with what
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depth in a fluid but is independent of volume
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absolute pressure is what
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measure in reference to a vacuum
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weight density is what
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ratio of an object's weight to its volume
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voltage comes in what to types of forms
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AC and DC
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voltmeters measure what
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voltage difference
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Multimeters measure what
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volts amps and resistance in Ω
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the positive pole in a battery is called what
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anode
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thermocouple uses what
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three wires of 2 different metals to measure difference
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were is the ° symbol located in temperature difference
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after the F° or C°
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work equals what
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force(or a force like quantity) x distance
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input work is performed by who
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work going into a system done by the operator
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output work is
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work done by the system
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efficiency is what
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work out divided by work in x 100
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spring scales are used to measure what
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input and output forces
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what are the basic units of work
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SI Newton x meter
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linear mechanical work is performed when?
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mass in moved in straight line
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angular mechanical work is performed when
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mass is moved in a rotation
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mechanical work cause an object to do what
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stop go or turn
start moving stop moving or rotate |
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fluid work is equal to what
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pressure difference x times the volume moved
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is the fluid in a closed system reused
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yes
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the work done by the piston is equal to what
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pressure exerted by a piston multiplied by the area of the piston face
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electrical work is done when what
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the cross sectional area of a cylinder can by found by multiplying 0.7854 by the diameter
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electrical charge can be calculated by what
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amps x time
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what is the basic unit of electrical charge
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1 joule
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rate is what
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displacement-like quantity divided by elapsed time
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velocity is a measure
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linear mechanical work
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speed is similar to work
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speed is a scalar
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angular rate is expressed in what
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rads/seconds
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acceleration is another name of what
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speed or velocity
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flow rate is
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volume of fluid moved in a given period of time
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units of fluid flow are
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gallons/minute
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viscosity is
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quality of a substance related to its thickness
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electrical rate is what
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amount of charge moved in coulombs
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electrical current flow is symbolized by what
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I measured in amperes
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one Milli-ampere is =
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1/1000 amps
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an ammeter is used to measure what
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current measures in amps
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Hertz is a measure of
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frequency in alternating currents
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an oscilloscope can measure what
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frequency as well as voltage
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heat flow is symbolized as what
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Qh
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heat flow rate is
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amount of heat energy transferred through a substance in a unit of time
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a Dewar flask is what
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used to contain and store energy
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what is a thermal couple thermometer
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used to measure heat flow rate
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unifying equation for resistance is
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force like quantity divided by a rate
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what are the two forms of resistance in a mechanical system
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drag and friction
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equation for friction
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force times coefficient of friction
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equation for drag resistance
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resistance equals force divided by velocity
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result of drag resistance
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disruption of airflow as an object moves.
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sliding force must be overcome to what
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start an object moving
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kinetic friction must be overcome to what
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keep a moving object moving
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static friction is greater than
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kinetic friction
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friction can be reduced by add what
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lubricants
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fluid resistance is
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resistance generated by a solid moving through a fluid
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unifying equation for resistance is
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force like quantity divided by a rate
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what are the two forms of resistance in a mechanical system
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drag and friction
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equation for friction
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force times coefficient of friction
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equation for drag resistance
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resistance equals force divided by velocity
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result of drag resistance
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disruption of airflow as an object moves.
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sliding force must be overcome to what
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start an object moving
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kinetic friction must be overcome to what
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keep a moving object moving
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static friction is greater than
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kinetic friction
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friction can be reduced by add what
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lubricants
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fluid resistance is
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resistance generated by a solid moving through a fluid
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laminar flow is
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opposite of turbulent flow
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formula for fluid resistance
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rf = Dp/Qv
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electrical resistance is equal to what
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DV/ I
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ohms law is
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standard equation for calculating electrical resistance
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resistors are used for
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to control the amount of voltage in a circuit
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conductors
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materials that permit the free flow of electrons
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insulators
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materials that do not permit the free flow of electrons
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semi conductors
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alolow some currents to pass
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thermal resistance is
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opposition to the flow of heat through a material
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thermal conductivity
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quality of a material that describes how well it transmits heat
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energy is the
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ability to do work
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what is used to overcome resistance in a system
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energy in the form of heat
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pot energy is what
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stored energy waiting to be used
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the formula for pot enegry is
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Ep =force * height
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gravitational pot energy s
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energy an object has because it has been raised against the force of gravity on earth
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elastic pot enery
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energy an object has because its shape has been temporarily changed
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