•What was the point of this activity?
To demonstrate how sound waves work and its effect it has on objects nearby using glass, fork, string, and tuning forks.
•Explain how you would introduce this to your class.
Allow students to move throughout the room as I play music in one speaker of the classroom. Now, ask students what did you hear as you moved away from the speaker? Then, we will introduce the types of sound waves and how each sound waves determine how loud or quiet the sound is. Students will work in small groups to work on the activity and write down observations.
•Where do you see a student having difficulty with this?
-Understanding how sound waves affect the object it is hitting against
-Determining and differentiating what types of sound waves are affecting the salt, wine glass, and fork.
•What changes or extensions could you do to this activity?
Bring in instruments-guitar (see’s string vibrating), piano, placing a piece of paper to a speaker, bring in varieties of cups-mugs, glass, tall cup
As we place the vibrating tuning fork near the plastic membrane of the cup, soundwaves vibrate in the air causing the salt to move. As you rub your finger against the wine glass, the friction of your finger produces a frequency. The amount of water in the glass determines the pitch of the frequency. During the Amazing Fork activity, the fork is hit against the table, the sound is muffled. Once the tied fork is swung against the table, you will hear a louder frequency. The soundwave travel through the string producing a louder frequency.