Properties of Sound

What is sound? Something you hear Caused by vibrations Something is moving

Can you identify these sounds? Flute, piano, violin Snare, trumpet, banjo

What are vibrations?

Compression Waves

Does sound travel better through a solid, a liquid, or a gas?

Look at the molecules in a solid, liquid, and gas Look at the molecules in a solid, liquid, and gas. How are they different?

Energy Transfer

Investigate Sound Travel How can the sound of your voice travel from your phone to mine? Design and build a 2-person phone. Then, set up a phone network that allows 4 people to speak and hear each other. Styrofoam cups, plastic cups, string, aluminum cans, wire Review the elements of a string telephone that makes it work well. Explain that those elements help sound vibrations to travel better.

What is pitch? How can we change pitch? “Long is low” “Slow is low”

How can we make music with these?

Mary Had A Little Lamb 4 Ma - ry had a lit – tle lamb lit – tle lamb 4 lit – tle lamb Ma - ry had a lit –tle lamb whose 4 fleece was white as snow.

2014 Standards 4.P.4B. Conceptual Understanding: Sound, as a form of energy, is produced by vibrating objects and has specific properties including pitch and volume. Sound travels through air and other materials and is used to communicate information in various forms of technology.   Performance Indicators: Students who demonstrate this understanding can: 4.P.4B.1 Plan and conduct scientific investigations to test how different variables affect the properties of sound (including pitch and volume). 4.P.4B.2 Analyze and interpret data from observations and measurements to describe how changes in vibration affects the pitch and volume of sound. 4.P.4B.3 Define problems related to the communication of information over a distance and design devices or solutions that use sound to solve the problem.

Engineering Design Process Step 1: Present the Problem How can the sound of your voice travel from your phone to mine? How can we use glass flasks and water to play a song? Step 2: Imagine the Possibilities: Brainstorm! Step 3: Make a Plan and Predict Step 4: Design and Build Step 5: Reflect and Revise