Study guide: Sound and Vibrations
Connect vibration, sound and messages.
Ideas to explain in your own words
- Sound is produced by vibrating matter. A vibration is a repeated back-and-forth movement. Our cards describe motion; do not make loud sounds near anyone’s ears.
- A sound source vibrates. Sound travels through matter to a receiver. A drawing’s arrows show a pathway, not objects flying from a bell into an ear.
- An agreed code connects a sound pattern to a message. A different code may assign another meaning. Use only this code: one beat stop, two go, three help, four wait.
- Frequency describes vibrations per time; faster vibrations can make a higher pitch. Loudness and pitch differ. Early learners use the supplied labels rather than measuring sound.
Useful vocabulary
- vibration
- repeated back-and-forth motion
- source
- object producing the vibration
- stop
- one beat in this supplied code
- higher pitch
- described faster vibration
Watch your reasoning
- Check what vibration and sound each mean. They describe different clues.
- Check what source and path each mean. They describe different clues.
- Check what stop and go each mean. They describe different clues.
A worked review example
Worked reference-card problem: a card states “repeated back-and-forth motion”; a second states “disturbance heard after vibrations travel.” The first fits vibration and the second fits sound. The reason is the described function or change, not the order of the cards or a favorite name. If their descriptions exchange places, their category labels exchange too. Keep the supplied descriptions attached to the correct case. Worked reference-card problem: a card states “object producing the vibration”; a second states “material through which sound travels.” The first fits source and the second fits path. The reason is the described function or change, not the order of the cards or a favorite name. If their descriptions exchange places, their category labels exchange too. Keep the supplied descriptions attached to the correct case. Worked reference-card problem: a card states “one beat in this supplied code”; a second states “two beats in this supplied code.” The first fits stop and the second fits go. The reason is the described function or change, not the order of the cards or a favorite name. If their descriptions exchange places, their category labels exchange too. Keep the supplied descriptions attached to the correct case. Worked reference-card problem: a card states “described faster vibration”; a second states “described slower vibration.” The first fits higher pitch and the second fits lower pitch. The reason is the described function or change, not the order of the cards or a favorite name. If their descriptions exchange places, their category labels exchange too. Keep the supplied descriptions attached to the correct case.
Make a practice plan
- Use an example from Find a vibration. Say what happens and point to the clue that helps explain it.
- Complete Connect source and receiver and correct the specific misconception in its feedback.
- Resolve a changed case from Read a sound signal, then combine the four ideas in the transfer task.