What do these images have in common?
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Transcript of What do these images have in common?
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What do these images have in common?
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They are all WAVES!!!Time for Surfing!!!
Why Waves Are Wonderful!!
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Imagine that your family has just returned home from a day at the beach. You had fun playing in the ocean under a hot sun. You put some cold pizza in the microwave for dinner, and you turn on the radio. Just then, the phone rings. It's your friend calling to ask about homework.
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Unit 4The Nature of Waves
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What are the major parts of a standard wave?
What are the different types of wave? How do waves travel? How are waves pertinent to my everyday
life?
Unit Goals
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A TRANSFER OF ENERGY through matter OR empty space
A MEDIUM is any material that a wave travels through. A medium can be a solid, liquid or gas.
What Is A Wave?
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As a wave is traveling it is moving everything else in its path (waves working).
Anything floating on the surface of water is being worked by waves.
Example: Boats and ducks bob up and down on a waves shows that waves are transferring energy.
Waves and Work
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Can anyone describe the energy transfers that are occurring here?
Moving Object
Medium=Water
Waves show transfer of energy from propeller through water
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A MEDIUM is any material that a wave travels through. A medium can be a solid, liquid or gas.
A medium can be a solid, liquid or gas. The plural ( more than one) of medium
is media
Medium
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Mechanical Electromagnetic
There are Two Major Categories of Waves
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Need a medium to transfer energy! CANNOT travel through empty space
OCEAN WAVES AND SOUND WAVES ARE EXAMPLES
Mechanical Waves
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Do not need a medium, CAN travel through empty space!
Electromagnetic waves (light waves, microwaves, x-rays) can travel through empty space
Electromagnetic Waves
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There are three type of waves: - Transverse- Longitudinal- Surface/Water
Types of Waves
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Transverse waves- are particles that move in an up –and- down motion. The particles in a transverse wave move across or perpendicular
The highest point on a transverse wave is called a Crest
The lowest point on a transverse wave is called a Trough
Transverse Wave
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Transverse Wave
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Longitudinal waves- particles of the medium vibrate back and forth along the path the wave moves.
Compression- the part of the longitudinal wave where the particles are crowded together
Rarefactions- where the particles are spread apart
Longitudinal Waves
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Use your JUMP ROPE! To demonstrate a transverse wave:– Work with a partner– One of you move your end of the Rope back
and forth (left and right, like a snake crawling), perpendicular to its stretched length.
– The other student must hold his or her end of the Rope still
– A series of transverse waves will be generated and will travel through a medium (Rope)
Time to Practice!
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Longitudinal Waves
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A sound wave is a longitudinal wave. Sound waves travel by compressions and
rarefactions of air particles
Longitudinal Waves
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Use your Slinky to demonstrate a longitudinal wave: – Work with a partner– Stretch it out along the table– One of you grasp and draw several coils of a
stretched Slinky toward yourself – Release the coils– The other student must hold his or her end of the
Slinky still– A longitudinal wave pulse will be generated and
travel down the length of the Slinky (Medium)
Time to Practice!
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Combination waves- when a transverse wave and a longitudinal wave combine to form a surface wave.
Surface waves look like transverse waves, but the particles of the medium move in circles rather than up and down.
Surface and Combination Waves
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Properties of Waves
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A. Rest Position: The center of a wave; point where particles stay without disturbance
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1) AMPLITUDE2) WAVELENGTH3) FREQUENCY 4) SPEED
THERE ARE 4 BASIC PROPERTIES OF WAVES!
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Amplitude: The farthest distance the particles of a wave’s medium vibrate from their rest position; BIGGER=more energy
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Wavelength: The length of the wave; crest to crest or trough to trough; compression to compression; rarefaction to rarefaction; smaller=more energy
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Frequency: The number of waves produced in a given amount of time
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1) In you engineering notebook
2) On the top half of the page, use some yarn to make a transverse wave. Neatly label the crest and the trough!
3) On the bottom half of the page, make a longitudinal wave. Neatly label the compression and the rarefactions
Lets Make a Model!
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Speed at which a wave travels Wavelength x frequency = wave speed
Wave Speed
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Wavelength – 10 cm Frequency – 20 Hz Wavelength – 2 cm Frequency 4000 Hz
A wave has a wavelength of 5 cm. Its frequency is 700 Hz. What is its wave speed?
Let’s Try!
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Let’s Review!!!!
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Crest to CrestTrough to TroughMake a LARGE wavelength!Make a small wavelength!Which had more energy????
Wavelength
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Small amplitude and big wavelength
HUGE amplitude and small wavelength
Which would sound louder?Bigger amplitude – more energy!!
Amplitude
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Amplitude and Wavelength to our EARS
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Number of waves produced in a given amount of time
Measured in HERTZ (waves/second) Higher frequency = more energy PITCH related to frequency!
Higher pitch – higher frequency – more energy!
Frequency
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Draw a transverse wave with 5 full waves.Identify:
*Amplitude*Wavelength*Crest*Trough
Exit Ticket – On ENB Rest Position