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31 Cards in this Set
- Front
- Back
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first class lever
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input force and output force are always on opposite sides of the pivot.
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second class lever
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the effort force in and load force out are on the same side of the pivot. the effort is further away than the load.
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third class lever
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the effort and load are again on the same side of the pivot. the load is further away than the effort.
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mechanical advantage
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if the distance input changes then the output force should change. # of ropes
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ideal transformer
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is one that's 100% efficient
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a decrease in angular speed on the output pulley of a belt drive system causes the amount of torque on the output pulley to..
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increase
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when there is an increase in torque on the output pulley of a belt drive system, the angular speed of the output pulley
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decreases
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the actual mechanical advantage (AMA) of a belt drive-system equals
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the ratio of torques (Tout/Tin)
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the ideal mechanical advantage (IMA) of a rotational force transformer is always
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equal to or greater than the actual mechanical advantage
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how does the third and fifth gear of a simple gear train compare if both gears have an equal number of teeth
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rotation remains the same, no change in torque
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work input equals work output in a hydraulic jack is expressed as
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p1*v1=po*vo
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the ideal mechanical advantage of a jack is given as
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IMA=D1*Do
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to achieve a mechanical advantage in a hydraulic jack, the volume of fluid displaced at the input end and the output end is
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the same
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what remains the same from input to output in a pressure intensifier?
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force and piston movement
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what decreases from input to output in a hydraulic jack?
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piston movement
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an electric transformer with an IEA of 20, has an input coil rated at 2 amps. how much current can we expect to safely get from the ouput coil?
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0.1 amps
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In an electrical transformer designed to step down voltage, if resistance is present in the coil windings the actual electrical advantage can be found by
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dividing the current in by the current out
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this unit is NOT used for linear momentum in the SI system
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slug
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how does the linear impulse of a 10 pound fore acting on an object for 5 seconds compare to the linear impulse of a 5 pound force acting on the same object for 10 seconds?
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the same as
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in an isolated system, such as a rifle firing a bullet or two billiard balls colliding, the momentum before the interaction or event and the momentum after the event are
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equal
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in the english system of units a slug is a unit of
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mass
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a rotating object's moment of inertia times its angular velocity is known as
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angular momentum
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angular momentum is equal to the moment of inertia of the object
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multiplied by the angular rate
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Lmom (angular momentum) is equal to
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I*W
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the result of a torque acting on a rotating body is a change in angular velocity that results in a change in
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angular momentum
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when a torque acts on a rotating body for a certain period of time, the product of the torque and the time is known as
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angular impulse
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the power factor of an AC circuit is equal to the
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cosine of the phase angle between the voltage and current
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soldiers marching across a bridge are told to "break step". this is done so that
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they will not excite the natural frequency of the bridge and cause it to be destroyed
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the study of sound wave technology is called
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acoustics
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an optical flat and light waves are used to measure the flatness of a machined surface. the dark areas or bands seen in an interference pattern of light waves are the result of
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destructive interference of light waves
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an electronic instrument used to measure phase shift in electronic circuits is the
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oscilliscope
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