SLMS 7th Grade Science Energy Effects Unit 8 How do we hear sound? How is sound produced? How does sound travel?

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

Journal Entry Page 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 Fun YouTube

Part 2 Let’s explain the concept and define the terms. VIBRATIONS WAVES Describe each term as it relates to sound. Trace the path of the vibrations. Do you think we can feel the vibrations? Describe the vibrations in terms of atoms and molecules. How will the amount of air in the glass affect the sound?

WAVE FORM The longer the wavelength and the lower the frequency, the _______ the pitch (note). The shorter the wavelength and the higher the frequency, the _______ the pitch. How does this relate to different pitches of the wine glasses?

Student Demonstrations More Slinky Fun Light Waves are Transverse Sound Waves are Longitudinal Review Question: What is moving as you push the slinky? Change the speed and distance of the slinky motion. Draw and label a diagram of the slinky movement. Draw and write how the change in slinky movement resulted in a change in wavelength and frequency. Student Demonstrations

Sound Wave Simulator Vibrations in matter begin with particles that make up matter. Sound is a wave motion of many molecules being compressed together until they push away from one another and cause wave movement. They compress with other molecules and transfer sound energy to molecules nearby. The molecules return to their original position. Only the energy continues to move forward. The sound wave travels outward in all directions from the source

Sound Wave Simulation #2

Wrap Up Do you have any new information that explains why the wire/straw, in the first activity, moved across the wine glass? Make adjustments to your drawing on page 32. 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?

What we think about….. How the Sun Produces Light and Heat 5. What we think.. How can we What do we find out? conclude?

Explain in your own words how the sun produces heat and light. Science Talk / Word Sort cards Complete your journal entry. Ask yourself… - What do I think about what ______ said? - Why do I think that? What have I observed that supports the idea? - What resources do we have that help me with my written response? - What do my partners mean when they say _____? - Does anyone have the same answer but explain it differently? - Can we explain why the answer makes sense?

GREAT JOB! You have finished unit 1. I hope you had fun and learned something about solar energy. Your teachers will be looking over your student journals and will give you feedback (a grade) on your work. NOW ON TO PART 2!