What do these images have in common?

http://www.brainpop.com/science/energy/waves/

They are all WAVES!!!Time for Surfing!!!

Why Waves Are Wonderful!!

∗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

∗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??

∗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…

∗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

Page 606 in book!

∗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!

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

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

∗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

1. Identify each type of wave below.a.

b.

2. What is transmitted or transferred through a wave?

Exit Ticket

Wave Properties*

A. Rest Position: The center of a wave; point where particles stay without disturbance

B. Amplitude: The farthest distance the particles of a wave’s medium vibrate from their rest position; BIGGER=more energy (decibels)

C. Wavelength: The length of the wave; crest to crest or trough to trough; compression to compression; rarefaction to rarefaction; smaller=more energy #awesome

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!!!

∗Crest to Crest∗Trough to Trough∗Make a LARGE wavelength!∗Make a small wavelength!∗Which had more energy????

Wavelength

∗Small amplitude and big wavelength

∗HUGE amplitude and small wavelength

∗Which would sound louder?∗Bigger amplitude – more energy!!

Amplitude

Amplitude and Wavelength to our EARS

D. Frequency: The number of waves produced in a given amount of time (which other property is this directly related to??)

∗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

What is my frequency? This is one second…

∗Speed at which a wave travels∗Wavelength x frequency = wave speed

Wave Speed

∗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!

∗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!!

∗Like sound waves.∗And ocean waves.∗And Earthquake waves.∗We call these MECHANICAL WAVES.

Some Waves NEED a Medium!

∗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…

∗Mechanical NEED a medium.

∗Electromagnetic can use a medium, but don’t actually NEED it.

Soooo…

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