Mr.. Z’s “Waves” Unit #2 Mr.. Z about to catch some “Air”

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Presentation transcript:

Mr.. Z’s “Waves” Unit #2

Mr.. Z about to catch some “Air”

Mr.. Z’s “Riding One Home!”

Mrs. Z

Identify the two kinds of waves Identify crests and troughs, compression and rarefaction AIMAIM: What are two types of Mechanical waves?

Longitudinal, transverse, crest, trough, compression, rarefaction AIM:AIM: What are two types of Mechanical Waves?

What is a wave? The transfer of energy caused by a disturbance or a vibration

What is a Mechanical Wave? Definition: a Wave which requires a medium Do Electromagnetic Wave require a medium. NO

There are three types of mechanical waves  Transverse *  Longitudinal *  Combinations or surface waves * We are going to study these two types today

DRAW THIS IN YOUR NOTEBOOK This is picture of a transverse wave

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)

TRANSVERSE WAVES DEFINITION: The particles of the medium typically move perpendicular to the movement of the wave!

DRAW THIS IN YOUR NOTEBOOK

The highest point the waves reaches is called the crest.

The highest point the wave reaches is called the crest.

The lowest point is called the trough.

AIM: What are two wave Types?

What A ?

What C ?

AIM: What are two wave Types? What B ?

AIM: What are two wave Types? What B ?

Where is the Crest ?

Where is the trough ?

LONGITUTDINAL WAVES  “slinky waves” like the waves of a slinky (demonstrate) *** SHOW Transparency 58: Longitudinal Wave What is the other type of Mechanical Wave?

LONGITUTDINAL WAVES  Definition: the particles of the medium move parallel – or in the same direction – as the “movement of the wave”

 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

After the compression rarefaction pass, the medium (the slinky) returns to normal.

Where are the compressions?

Where are the rarefactions?

The crest of a transverse wave is similar to the compression of a longitudinal wave

Which way does the particles of the medium move

Tuning Fork Demonstration (click here)

Guitar Demonstration (click here) AIM: What are two wave Types?

Two Types of Mechanical Waves Transverse Longitudinal Crests and Troughs Compressions & rarefactions

Class Activity: W/S Concepts 7-2 PH 15-1 PH 15-1 Enrich AIM: What are two wave Types?

Homework: INTERNET QUESTIONS

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!