Energy Unit Week 33 Directions 1.Prepare your desk for science. Science notebook Signed matter test (if you didn’t have it yesterday – bring it to me) 2.Use voice level 0 (no voice) to review your sound energy notes on notebook pg. 81.

Targets & Warm Up Targets: Students will discover how making changes to a vibrating object affects how the object vibrates. Warm Up: What is a vibration? How are vibrations related to sound? Do all objects vibrate in the same way?

Table of Contents DateTitlePage Sound & Vibrations82 Once you are finished with the Table of Contents, go to page 81 and add the title and date to the top of the page.

Sound Occurs when objects vibrate (a quick back-and forth movement) The vibrations travel through air as sound waves If the waves reach our ears, we hear sound

Longitudinal Waves Particles move parallel to the direction the wave travels Particles vibrate side to side

Transverse vs. Longitudinal

How to Draw Waves

Important words for today: Frequency Pitch Thickness Tension

Wave Vocabulary Frequency: The number of waves that pass a certain point in a certain amount of time – Faster vibration = higher frequency – Slower vibration = slower frequency

Frequency Faster vibration = higher frequency Slower vibration = slower frequency

Wave Vocabulary Pitch: What makes a sound seem high or low Depends on a sound’s frequency – Faster frequency = high pitch – Slower frequency = low pitch

Pitch Faster frequency = high pitch Slower frequency = low pitch

Fill in the blanks Vibration: ____________ Frequency: ____________ Pitch: ____________ Vibration: ____________ Frequency: ____________ Pitch: ____________ fast high slow low

Listen to the sounds High pitch? Low pitch? Fast frequency? Slow frequency? Fast vibration? Slow vibration? How is pitch related to frequency and vibration?

Sounds

Today we will experiment with the thickness and tension of objects Thickness: the distance between the top/bottom or front/back of something Tension: A force tending to stretch or elongate something vibration, frequency, pitch Do you think that changing the thickness and tension of objects will change the vibration, frequency, and pitch?

Question to discuss: Guitar strings do not all have same thicknesses. Why?

Thickness of Guitar Strings

Question to discuss: What is the purpose of this section of the guitar? It increases and decreases the tension (tightens and loosens the string)

Tension of Rubber Bands

Extra Time? ngmusic/strings/ String Instruments (4 minutes)

Homework

Reflection Questions How does changing the thickness of an object affect the vibration of the object? How does changing the tension of an object affect the vibration of the object?

Targets (Revisited) Students will discover how making changes to a vibrating object affects how the object vibrates.

Homework SubjectHomeworkDue Date ScienceSound Energy worksheetMonday Bring home your science notebook to help you complete the assignment!