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Mechanical Waves and Energy Transfer
U2C1A3 RS Mechanical Waves and Energy Transfer
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Read the purpose on page 119.
Start RS U2C1A3 Read the purpose on page 119. How waves transfer energy from a source to a receiver?
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We Think…. How does energy get transferred from you or your friend, since none of the coils you are holding onto travel all the way to your friend’s end?
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What does the person at the other feel when the pulse reaches that end?
Do you think energy is being transferred from the hand #1 generating the pulse to the hand at the other end (hand #2)? Why do you think so?
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Does a transverse pulse with larger amplitude seem transfer more, less, or the same amount of energy as a pulse with smaller amplitude? How do you know? A E A E
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wave movie
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No! 4 and 5 A. each individual coil transfers energy to the next coil causing it to move side to side B. the coil’s position before & after the pulse passes is the same
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decreases frequency, wavelength (opposite ends of the alphabet)
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more energy b/c the person feels a stronger push on their hand
Amplitude, Energy (same end of the alphabet)
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compression (longitudinal) wave
Motion Force
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start compression waves
wave movie
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more energy b/c you feel a stronger push on your hand
Yes b/c the person holding the other end of the slinky feels a push. Energy is transferred from coil to coil until it reaches the hand on the other end more energy b/c you feel a stronger push on your hand
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12. What does each individual coil do as the compression pulse passes by?
each coil moves forward then backwards to its original position; each coil transfers energy to the next coil
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wave movie
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more energy b/c the person feels a stronger push
frequency, wavelength (opposite ends of the alphabet) more energy b/c the person feels a stronger push
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wave movie
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Amplitude, Energy more energy b/c the person feels a stronger push
(same end of the alphabet)
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Make Sense of Your Ideas
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1. What is the difference between transverse and compression waves?
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compression wave transverse wave Direction of FORCE Direction of WAVE
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transverse wave: direction of force direction of wave
compression wave: direction of force and direction of wave are the same direction
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Here is what the answer key says….
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Each coil transfers energy to the next coil
Each coil transfers energy to the next coil. After the wave passes the coil returns to its original position.
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3.
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Frequency, Wavelength
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There is a change in motion The receiver feels a push on their hand
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Frequency, Energy Amplitude, Energy
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Frequency, Energy Amplitude, Energy
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5.
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Summarize your Make Sense of Your Ideas answers.
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Consensus Ideas Types of waves: transverse wave: direction of force direction of wave compression wave: direction of force and direction of wave are the same direction
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Consensus Ideas Properties of waves: Frequency, Energy Amplitude, Energy Frequency, Wavelength
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