What do these images have in common?
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What do these images have in common?
http://www.brainpop.com/science/energy/waves/
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They are all WAVES!!!Time for Surfing!!!
Why Waves Are Wonderful!!
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∗Form a circle and hold hands with the people next to you.
∗Pass down a vibration! Once you vibrate, pass it on to the next person.
∗You are the MEDIUM (the substance through which a wave can travel; solid, liquid, or gas).
∗You are one of the tiny particles that is vibrating∗Once you vibrate, you pass it on to the next
particle!∗You are transferring energy – making a wave!!
Let’s Make Waves
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∗WAVE: any disturbance that transmits energy through matter or empty space.
Sound! WATER! TV!BRAIN LIGHT radio!Earthquakes! Cell phones!
Microwaves x-rays violin strings
What IS a Wave Anyway??
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∗A wave is a disturbance where energy is transmitted.
∗Through a medium that has tiny vibrating particles
∗The energy passes through and we have a WAVE!!
Wave A Minute…
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∗SLINKY TIME!!∗Transverse: The particles move
perpendicular to the direction the wave is traveling.∗ Light, radio waves, x-rays, Earthquake (seismic
waves) BIG tremor∗Longitudinal: The particles vibrate parallel
to the wave motion.∗ Sound∗ Earthquake (tremor before the BIG tremor)
SLINKY TIME 2!!!!
Types of Waves
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Page 606 in book!
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∗Transfer energy through a medium∗Transverse particles run perpendicular to
motion∗Longitudinal particles run parallel to motion∗Crests and troughs (transverse)∗Compressions and rarefactions (longitudinal)
One Last Wave!
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1. Play in a group.2. Roll the dice.3. Answer the question on communicator board. If
already answered, repeat answer verbally!4. If correct, move spaces. Use marker to track
movement.5. First person to end wins!!
Materials:*1 game board*1 dice*1 dry erase marker*1 eraser
Game Rules
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Let’s Play a GAME!!
If you roll a:∗ 1 – Name the two types of waves∗ 2 – Name an object in our world that gives off
waves∗ 3 – Demonstrate a transverse wave∗ 4 – Demonstrate a longitudinal wave∗ 5 – Define the highest and lowest points on a
transverse wave∗ 6 – Identify what is transferred through a wave
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∗If you roll a :∗ 1 – Which type of wave is better? Justify your
response.∗ 2 – Give examples of both a transverse and
longitudinal wave.∗ 3 – Which type of natural resource are we
using most as Americans, and why is this a problem?
∗ 4 – Explain how someone could differentiate between longitudinal and transverse waves (how are they different?)
∗ 5 – Explain how a sedimentary rock can become both a metamorphic and igneous rock over time.
∗ 6 – What happens when two tectonic plates separate?
Game Round 2
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1. Identify each type of wave below.a.
b.
2. What is transmitted or transferred through a wave?
Exit Ticket
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Wave Properties*
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A. Rest Position: The center of a wave; point where particles stay without disturbance
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B. Amplitude: The farthest distance the particles of a wave’s medium vibrate from their rest position; BIGGER=more energy (decibels)
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C. Wavelength: The length of the wave; crest to crest or trough to trough; compression to compression; rarefaction to rarefaction; smaller=more energy #awesome
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1.Draw a line in your ENB.1.What is this line called??
2.Make a transverse wave on the line
1.Point to CRESTS 2.Point to TROUGHS
Yarn Waves!!!
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∗Crest to Crest∗Trough to Trough∗Make 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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D. Frequency: The number of waves produced in a given amount of time (which other property is this directly related to??)
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∗Measured in HERTZ (waves/second)∗ 1 hertz=1 wave every second∗ Whistling – 10,000 Hz!!!∗ Connection between frequency and energy?
∗Higher frequency = more energy∗PITCH related to frequency!
∗ Higher pitch – higher frequency – more energy!
Frequency
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What is my frequency? This is one second…
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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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∗Wavelength – crest to crest∗Amplitude – rest position to crest or trough∗Frequency - # of waves in a given time∗Wave Speed – wavelength x frequency
WAVE GOT IT!
Review!!
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∗Like sound waves.∗And ocean waves.∗And Earthquake waves.∗We call these MECHANICAL WAVES.
Some Waves NEED a Medium!
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∗Don’t need a medium!∗But can STILL go through one! WHAT?!∗Like light waves.∗And microwaves (yes, those are waves that
cook your ramen noodles.)∗And tv and radio waves.∗We call these ELECTROMAGNETIC WAVES.
Over-Achieving Waves…
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∗Mechanical NEED a medium.
∗Electromagnetic can use a medium, but don’t actually NEED it.
Soooo…
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Draw a transverse wave with 5 full waves on a rest position.Identify:
*Amplitude*Wavelength*Crest*Trough*Frequency in Hz if the time was .5 seconds/half a
second. (hint – Hz measures waves per second)
Exit Ticket