Sound can be produced and transmitted. Key ideas include

1. sound is produced when an object or substance vibrates;
2. sound is the transfer of energy;
3. different media transmit sound differently;
4. sound waves have many uses and applications

CENTRAL IDEA -Energy can be transmitted through different media (solids, liquids, gases) in waves. The transfer of energy in waves causes vibrations that can produce sound. 

VIBRATING MATTER - COMPRESSION WAVES

Waves transmit energy from one place to another. Sound is produced as these waves cause vibrations as they travel through matter.

• Sound is a form of mechanical energy produced and transmitted by vibrating matter
  • Mechanical energy is the energy an object has due to its motion or position.

• In sound waves, energy is transferred through the vibration of particles of the medium through which the sound travels.
• Sound travels in compression waves and must have a medium through which to travel.
  • Sound also travels in liquids and solids

FREQUENCY, WAVELENGTH, PITCH & AMPLITUDE

• Objects vibrating rapidly have a higher pitch than objects vibrating more slowly
• Musical instruments vibrate to produce sound.
  • There are many different types of musical instruments and each instrument causes vibrations in different ways



• Remember: larger, longer or thicker vibrating objects create lower frequency (lower pitch) sounds. Likewise, smaller, shorter, or thinner (or stretched) vibrating objects create higher frequency (higher pitch) sounds.

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