Today’s Agenda…12-1Today’s Agenda…12-1

Bellringer: What is an electromagnet?Take up homeworkReview Magnet Worksheet from MondayNotes on Waves – Study Pack #13Exit Slip

WAVESWAVESStudy Pack #13

Today’s Goals…Today’s Goals…

I can explain the relationship between waves, energy, and matter.

I can describe the difference between transverse waves, and compressional waves.

What is a wave?What is a wave?

The way energy moves from place to placeExamples:

– Sound moves from my mouth to your ears– Light moves from a bulb to a book page to your

eyes– Heat waves move from the sun to the Earth

What is a wave?What is a wave?

How does energy move in a wave?– All waves are produced by something that is

vibrating (moving)– That energy is transferred to particles– Then, particles bump into each other and

transfer energy from one to the next– In a wave, the energy moves, but not the matter– A model for waves; page 227

Mechanical WavesMechanical Waves

Waves that need matter to transfer energyThat matter that the wave travels through is

called the mediumExample:

– For waves in an ocean, the medium is the water– Sound waves travel through the medium of air

Mechanical WavesMechanical Waves

There are two types of mechanical waves:– Transverse– Compressional

Transverse WavesTransverse Waves

Energy causes the matter in the medium to move up and down or side to side

Example: Waves in waterFigure 3Draw a picture

of a transverse wave

Compressional WaveCompressional Wave

Matter in the medium moves back and forthExample: Sound waves; page 229Figure 4Draw a picture

of a compressional wave

Electromagnetic WavesElectromagnetic Waves

Waves that can travel through space where there is no matter

Examples: radio waves and light waves

See what they look like!See what they look like!

WAVES

Exit SlipExit Slip

What is the relationship between waves, energy, and matter?

Describe the difference between transverse and compressional waves.

Put your answers in the tray on the way out!