The students will turn to their partner and ask a question while holding their hands to their throats. If the students are having trouble feeling the vibrations, then ask them to speak louder.
Discuss as a class what the students felt. Discuss the vocabulary term vibration.
Divide students into small groups. Pass out the needed materials to each group. Demonstrate how to properly use a tuning fork.
Allow the students to strike a few objects (desk, book, etc.) with the tuning fork to explore how to use it and what sounds are created from different objects. Discuss with the class what they think is making the sounds.
Ask the students to strike their desk with the tuning fork then touch their cheek with the tuning fork. Discuss what the students heard and felt. Reiterate that the vibrations are the back-and-forth movement created by striking the tuning fork. Students should connect that the vibrations are creating the sound.
Ask the students to strike the tuning fork on their desk then gently touch the top of the water in the cup. Pose the following questions to the students.
- What did you hear?
- What did you see?
- What made the tuning fork make sound?
- What happened to the water when the vibrating tuning fork touched it?
Students should explain that they could see the water "jumping" from the vibrations of the tuning fork.
Allow the students time to clean up any water with the paper towels.
The teacher should lead a class discussion after each step of the explore to discuss that vibrating matter can create sound and that sounds can make things vibrate.
One student will hold the ping pong ball by the thread in the air in a stationary position. Another student will strike the tuning fork on the desk then gently touch the stationary ball. Ask the students the following questions.
- What did they hear?
- What did they see?
- What happened to the ball when the vibrating tuning fork touched it?
The students should discuss the movement of the ball as an effect of the vibrations made by the tuning fork. Why did the ball move back and forth?