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25 Cards in this Set
- Front
- Back
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Wave
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a disturbance traveling in an elastic medium
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Types of waves:
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Transverse, longitudinal, sinusoidal, and impulsive
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Transverse wave
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waves in which the particles in the medium move perpendicular to the direction in which the wave travels. Ex. water waves & the "wave" @ football games
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Longitudinal wave
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waves in which the particles in the medium move parallel to the direction in which the wave itself travels. Ex.
sound waves & slinky |
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Sinusoidal wave
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are oscillatory wave shapes that have a special simple shape like a mathematical sine or cosine curve. smooth undulating shape
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Impulsive wave
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made up of a single burst of one or several pulses. Ex.
a bang noise, like clapping your hands. |
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Oscillatory waves
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wave shapes that always have a repeating pattern
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Propagation velocity (or wave velocity)
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the speed at which something moves along a wave
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Speed
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distance divided by time
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Medium velocity
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the speed with which a point of the medium moves as the wave passes that point
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Five properties of waves:
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wavelength, cycle, period, amplitude, and frequency
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wavelength
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the distance from one peak of the wave to the next adjacent peak. The distance a wave moves in one period.
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cycle
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a complete round trip of point B from its original position, up, down all the way to its lowest position, and back to its original
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period (T)
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the time required to complete one cycle (time per cycle)
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amplitude (A)
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the maximum distance that point B is displaced from its normal nonvibrating position. amplitude is the maximum value of the displacement.
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frequency (f)
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the number of cycles per second of time. Usually referred to in Hertz (Hz). Ex. 2 cycles per second =
2 Hz |
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Displacement
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the distance that point B (or other point) is moved from its normal nonvibrating position. (the position when there is no wave)
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Wave (or propagation) velocity
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the speed with which a crest or any other part of the wave moves in the direction of the wave
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Pitch
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sensation of different sounding frequencies. The greater the frequency, the higher the pitch.
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Pure tone
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vibrations that occur at the same frequency
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Mass
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a measure of the amount of material in a body
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Inertia
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the tendency of a body to remain in its present state of motion. if at rest, a body will stay at rest unless there is a force to get it moving. if it is in motion, a force is required to make it move faster/slower
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Friction
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a force caused by the surface roughness of two objects in contact when one object moves relative to the other.
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pressure
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force per unit area.
pounds per square inch or Newtons per square meter |
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Pascals
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Newtons per square meter
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