Mechanical Waves and Energy Transfer

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Presentation transcript:

Mechanical Waves and Energy Transfer U2C1A3 RS Mechanical Waves and Energy Transfer

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?

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?

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?

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

wave movie

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

decreases frequency,  wavelength (opposite ends of the alphabet)

more energy b/c the person feels a stronger push on their hand Amplitude, Energy (same end of the alphabet)

compression (longitudinal) wave Motion  Force 

start compression waves wave movie

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

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

wave movie

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

wave movie

Amplitude, Energy more energy b/c the person feels a stronger push (same end of the alphabet)

Make Sense of Your Ideas

1. What is the difference between transverse and compression waves?

compression wave transverse wave Direction of FORCE Direction of WAVE

transverse wave: direction of force  direction of wave compression wave: direction of force and direction of wave are the same direction 

Here is what the answer key says….

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.

3.

 Frequency,  Wavelength

There is a change in motion The receiver feels a push on their hand

 Frequency, Energy  Amplitude, Energy

 Frequency,  Energy  Amplitude,  Energy

5.

Summarize your Make Sense of Your Ideas answers.

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 

Consensus Ideas Properties of waves:  Frequency, Energy  Amplitude, Energy  Frequency,  Wavelength