Warm-up

What do you know about waves?Don’t say nothing!!

Give me at least two sentences

What are waves?

Coordinated Science

What are waves?

A wave is a periodic disturbance that carries energy

A “medium” is the matter that the wave travels through.

Waves carry energy without carrying matter.

In water waves, water molecules bump each other and pass energy

from molecule to molecule to create a wave.

Ball pass example.

Forms of Waves(slinky example)

Transverse Waves The wave energy

causes the matter move in an S-formation.

Compressional Waves

The wave energy moves forwards and backwards in the direction that the wave is traveling.

Crest and Trough

trough

Crest

Amplitude Amplitude: The measure of how high the

crests are or how low the troughs are from the rest point in the middle.

The more energy the higher the amplitude

Wavelength

The distance from the top of one crest to the top of the next.

Frequency

the number of wavelengths that pass a given point in 1 second.

The unit of measure is hertz. (Hz)

Draw a wave with a small frequency:

Draw a wave with a large frequency:

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

PictureWave #1 (any way you want)Wave #2 higher amplitude than Wave #1 Wave #3 higher wave length than Wave #1

Draw each wave you make and label the following on each wave: crest , trough, amplitude, and wavelength

Answer the following questions in your journal:

Did you make a compressional or transverse wave? How do you know?

Which wave do you think took more energy to make? Wave #1 or wave #2?