17.1 Mechanical Waves

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17.1 Mechanical Waves
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What is a mechanical wave?

• A mechanical wave is a disturbance in matter that
  carries energy from place to place

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What do mechanical waves require?

• Mechanical waves require a medium.

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What is a medium?

• A medium is the material through which a wave
  travels.

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How are mechanical waves created?

• Mechanical waves are created when a source of
  energy causes a vibration to travel through a
  medium.

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What is a transverse wave?

• A transverse wave causes the medium to vibrate _at_
  right angles to the direction the wave travels.

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Draw a picture of a transverse wave label
crest, trough, rest
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Name an example of a transverse wave.

• Shaking a rope shaking a blanket are examples
  of transverse waves.

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What is a longitudinal wave?

• A longitudinal wave is a wave in which the
  vibration of the medium is parallel to the
  direction the wave travels.

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Draw a longitudinal wave label compression and
rarefaction
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Name an example of a longitudinal wave.

• Slinky springs P waves (aka primary waves)
  produced by earthquakes are examples of
  longitudinal waves.

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What is a surface wave?

• A surface wave is a wave that travels along a
  surface separating 2 media like air and water

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What is the most familiar kind of surface wave?

• Ocean waves are the most familiar surface waves.

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A surface wave causes a bobber floating on the
water to move an up-and-down motion, as well as a
back-and-forth motion. The combined effect of
both types of wave motion causes the bobber to
move in a circle
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Bobber buoy
http//footage.shutterstock.com/video.html?id2861
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