Warm Up 3

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Warm Up 3

• 11 A student uses a hot plate, a thermometer, and
  a stopwatch to investigate the rate at which a
  metal object conducts heat. To ensure the most
  reliable results, which of the following should
  the student do?
• A Perform a second investigation using different
  tools
• B Use several thermometers to measure temperature
• C Develop a hypothesis before starting the
  investigation
• D Repeat the entire investigation several times

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I. The Nature of Waves

• Wave - a repeating disturbance or movement that
  transfers energy through matter or space
• 1. Molecules pass energy on to other molecules.
• 2. Waves carry energy without transporting matter.

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The Nature of Waves

• 3. All waves are produced by something that
  vibrates.
• 4. Mediuma material through which a wave
  travels.
• a. May be solid, liquid, or gas
• b. Not all waves need a medium to travel
  through example light waves

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Mechanical Waves

• Transverse waves
• Longitudinal (AKA compression) wave
• Combination wave (both Transverse and
  Longitudinal)
• They can only travel through matter (solid,
  liquid or gas)

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Transverse vs longitudinal

• What are the differences between these 2 types of
  waves?

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Transverse vs longitudinal

• Did any piece of the spring move from the far
  left to the far right?
• What was transferred from left to right?

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Transverse vs longitudinal

• Similarities?
• Differences?

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B. Mechanical waves

• 1. Transverse wavesmatter in the medium moves
  perpendicular to the direction that the wave
  travels

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Matter moves this direction
Energy travels this direction
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2. Compression waves

• matter in the medium moves in the same direction
  that the wave travels

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Examples of waves

• Transverse wave Electromagnetic waves, light
  waves
• Longitudinal wave sound waves, shock waves
• Combination wave seismic wave, water waves

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II. Wave Properties

• II. Wave Properties
• A. Waves differ by
• 1. How much energy they carry
• 2. How fast they travel
• 3. How they look

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Parts of a Transverse Wave

• Wavelength the distance between one point in
  the wave and the nearest point just like it.
• Crest top of a wave, hill
• Trough bottom of a wave, valley
• Amplitude height or depth of a wave from a
  central line

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Wavelength
Crest
Amplitude
Trough
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Longitudinal Wave

• Find the compression, rarefraction and
  wavelength in this compression wave.

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Compression waves
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Exit Ticket

• Watch the video
• What kind of wave is inside the tube?
• What kind of wave is outside the tube?

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Parts of a compression wave

• Dense regions called compressions
• Less dense regions called rarefractions
• Wavelength