WAVES Waves are all around us CAN YOU

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WAVES

WAVES

Waves are all around us…. CAN YOU NAME A FEW?

Waves are all around us…. CAN YOU NAME A FEW?

Just a few examples

Just a few examples

What is a wave? �Disturbance or movement that transfers energy through matter or space

What is a wave? �Disturbance or movement that transfers energy through matter or space �Doesn’t cause any permanent displacement Example: A wave moves through a crowd, but each person still stays in their seat.

What is a wave? �This energy must move through a medium. �The medium can

What is a wave? �This energy must move through a medium. �The medium can be solid, liquid or gas. Examples of mediums: �Water �Air �People �The ground

Two Types of Waves �Transverse Wave �Compression Wave � Definition: A wave where the

Two Types of Waves �Transverse Wave �Compression Wave � Definition: A wave where the particles move up and down. The particles move at a right angle to the motion of travel. � Definition: A wave where the particles move left to right. The particles move in the same direction as the motion of travel. � Example: Water wave � Diagram: Slinky � Diagram: �We will be focusing more on TRANSVERSE waves!

Characteristics of a Wave: �CREST: The highest point in a wave �TROUGH : The

Characteristics of a Wave: �CREST: The highest point in a wave �TROUGH : The lowest point in a wave

Characteristics of a Wave: �REST POSITION: the level of the water between the crest

Characteristics of a Wave: �REST POSITION: the level of the water between the crest and trough. �AMPLITUDE: the height of the crest or depth of the trough as measured from its rest position.

Characteristics of a Wave: �WAVELENGTH: the distance from crest to crest or trough to

Characteristics of a Wave: �WAVELENGTH: the distance from crest to crest or trough to trough.

�Wave on a string �Label the following diagram:

�Wave on a string �Label the following diagram:

�Label the following diagram: Crest Wavelength Amplitude Rest Position Trough

�Label the following diagram: Crest Wavelength Amplitude Rest Position Trough

Characteristics of a Wave: �FREQUENCY: The number of repetitive motions that occur in a

Characteristics of a Wave: �FREQUENCY: The number of repetitive motions that occur in a given time. �Measured in hertz (Hz), or cycles per second �Related to wavelength

�Frequency: 1 Hz 1 cycle per second Shorter frequency �Longer wavelength �Frequency: 2 Hz

�Frequency: 1 Hz 1 cycle per second Shorter frequency �Longer wavelength �Frequency: 2 Hz 2 cycles per second Longer frequency �Shorter wavelength

�The longer the wavelength, the shorter the frequency. �The shorter the wavelength, the longer

�The longer the wavelength, the shorter the frequency. �The shorter the wavelength, the longer the frequency. �When one value increases as the other decreases, this is called an inverse relationship.

� 4 volunteers Bouncer A and Counter A Bouncer B and Counter B �Question

� 4 volunteers Bouncer A and Counter A Bouncer B and Counter B �Question we are trying to answer: How many times can you bounce the ball in 30 seconds? �What are some variables we should try to control? Height of the bounce Type of ball

�Waves are disturbances that In Summary … transfer energy through matter or space �Crest

�Waves are disturbances that In Summary … transfer energy through matter or space �Crest �Trough �Amplitude �Wavelength �Frequency �Wavelength and frequency have an inverse relationship

Please work on: Now… �The example problems on the last page of your note

Please work on: Now… �The example problems on the last page of your note package �Features of a Wave and Characteristics of a Wave worksheet