SLMS 7th Grade ScienceEnergy Effects

Unit 8How do we hear sound?How is sound produced?How does sound travel?

DemonstrationYouTube

1. What would happen if you rubbed your finger on the glass in a circular motion?

2. Now look at the glass with the wire? - What did you observe? - How was the sound generated? How could you hear it? - What made the wire move? - What other sounds have you heard that are

generated in the same way? - How could we find out what is happening?

Part 1

Journal EntryPage 32

1. Draw and label a diagram of the wine glass demonstration.

2. What do you think is happening to make the wire move?

More Wine Glass FunYouTube

Part 2Let’s explain the concept

and define the terms.VIBRATIONS WAVES

1.Describe each term as it relates to sound.2.Trace the path of the vibrations.3.Do you think we can feel the vibrations?4.Describe the vibrations in terms of atoms and molecules.5.How will the amount of air in the glass affect the sound?

WAVE FORM

1. The longer the wavelength and the lower the frequency, the _______ the pitch (note).

2. The shorter the wavelength and the higher the frequency, the _______ the pitch.

3. How does this relate to different pitches of the wine glasses?

More Slinky FunLight Waves are Transverse

Sound Waves are LongitudinalO Review Question: What is moving as you push

the slinky?

1. Change the speed and distance of the slinky motion.

2. Draw and label a diagram of the slinky movement.

3. Draw and write how the change in slinky movement resulted in a change in wavelength and frequency.

Student Demonstrations

Sound Wave SimulatorO Vibrations in matter begin with particles that

make up matter.O Sound is a wave motion of many molecules

being compressed together until they push away from one another and cause wave movement.

O They compress with other molecules and transfer sound energy to molecules nearby.

O The molecules return to their original position. Only the energy continues to move forward.

O The sound wave travels outward in all directions from the source

Sound Wave Simulation #2

Wrap UpO Do you have any new information that

explains why the wire/straw, in the first activity, moved across the wine glass?

O Make adjustments to your drawing on page

32.

O Describe how the slinky is used to demonstrate the motion of sound waves

What we think about…..How the Sun Produces Light and Heat

5. What we think.. How can we What do we find out? (Questions) conclude?