Download - Mr.. Z’s “Waves” Unit #2
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Mr.. Z’s “Waves” Unit #2
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Mr.. Z about to catch some “Air”
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Mr.. Z’s “Riding One Home!”
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Mrs. Z
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Identify the two kinds of waves
Identify crests and troughs, compression and rarefaction
AIM: What are two types of Mechanical waves?
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Longitudinal, transverse,
crest, trough, compression, rarefaction
AIM: What are two types of Mechanical Waves?
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What is a wave?
The transfer of energy caused by a disturbance or a vibration
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What is a Mechanical Wave?
Definition: a Wave which requires a medium
Do Electromagnetic Wave require a medium.
NO
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There are three types of mechanical waves
Transverse *
Longitudinal *
Combinations or surface waves
* We are going to study these two types today
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DRAW THIS IN YOUR NOTEBOOK
This is picture of a transverse wave
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TRANSVERSE WAVES
EXAMPLE: “waves made with the rope”
EXAMPLE: “water waves”
DEMONSTRATE: When the wave moved in one direction, which way did the particles of the medium move? (Duck, Ribbon)
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TRANSVERSE WAVES
DEFINITION:
The particles of the medium typically move perpendicular to the movement of the wave!
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DRAW THIS IN YOUR NOTEBOOK
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The highest point the waves reaches is called the crest.
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The highest point the wave reaches is called the crest.
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The lowest point is called the trough.
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The lowest point is called the trough.
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AIM: What are two wave Types?
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What is @ A ?
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What is @ A ?
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What is @ C ?
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What is @ C ?
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AIM: What are two wave Types?
What is @ B ?
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AIM: What are two wave Types?
What is @ B ?
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Where is the Crest ?
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Where is the Crest ?
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Where is the trough ?
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Where is the trough ?
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LONGITUTDINAL WAVES
“slinky waves” like the waves of a slinky (demonstrate)
*** SHOW Transparency 58: Longitudinal Wave
What is the other type of Mechanical Wave?
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LONGITUTDINAL WAVES
Definition: the particles of the medium move parallel – or in the same direction – as the “movement of the wave”
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DEMONSTRATE WITH A SLINKY
The area where the coils are compacted is called the COMPRESSION
The area where the coils are spread out is called the RAREFACTION
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After the compression rarefaction pass, the medium (the slinky) returns to normal.
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Where are the compressions?
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Where are the compressions?
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Where are the rarefactions?
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Where are the rarefactions?
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The crest of a transverse wave is similar to the compression of a
longitudinal wave
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Which way does the particles of the medium move
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Which way does the particles of the medium move
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Tuning Fork Demonstration
(click here)
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Guitar Demonstration
(click here)
AIM: What are two wave Types?
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Two Types of Mechanical Waves
Transverse Longitudinal
Crests and Troughs
Compressions & rarefactions
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Class Activity:
W/S Concepts 7-2
PH 15-1
PH 15-1 Enrich
AIM: What are two wave Types?
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Homework:
INTERNET QUESTIONS
AIM: What are two wave Types?
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AIM: What are two wave Types?
The particles of an ocean wave actually move in a circular direction.
It’s the energy that is moving forward towards the beach -- not
water from far away!