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Waves: Carrying Energy Without Carrying Matter

Students explore how waves — in water, sound, and light — carry energy from place to place, and learn to measure a wave by its amplitude, wavelength, and frequency.

Grade 8Waves55 minutes1 class period5E ModelExplicit teaching4 StandardsCommon Core
Start the Lesson
Lesson at a Glance

Everything you need before the bell rings

Learning Objectives

Students will be able to…

  • ✓Explain that waves carry energy.
  • ✓Identify amplitude and wavelength.
  • ✓Explain frequency.
  • ✓Relate amplitude to energy.
Essential Question

A wave crosses the whole ocean, but the water mostly stays put. How can a wave travel and carry energy without carrying the stuff it moves through?

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Lesson Phases
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Vocabulary Terms
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Standards Aligned
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Interactive Task
Wave Tool · Interactive

The Wave Tool

Project this and change the amplitude and wavelength. Watch the wave reshape, and connect amplitude to energy and wavelength to frequency.

〰️ Change the wave — amplitude & wavelengthTry it
Amplitude: 30
Wavelength: 80

The Lesson · 5E Model

55 minutes, five moves

Tap any phase to open the teacher moves and student actions.

1

Engage — The Wave Paradox

5 min

A wave crosses the ocean, but the water stays put — how?

👩‍🏫 Teacher Moves

  • Demo a wave (rope or water).
  • Ask what actually travels.
  • Set the goal: waves.

🎒 Student Actions

  • Watch the wave.
  • Notice matter stays.
  • Predict the answer.
2

Explore — Explore Waves

12 min

Students investigate.

👩‍🏫 Teacher Moves

  • Send students to the Wave Tool.
  • Change amplitude and wavelength.
  • Record the effects.

🎒 Student Actions

  • Change the wave.
  • Record effects.
  • Label the parts.
3

Explain — Amplitude, Wavelength, Frequency

13 min

Teacher explains.

👩‍🏫 Teacher Moves

  • Waves carry energy, not matter.
  • Amplitude = height = energy.
  • Wavelength and frequency are linked.

🎒 Student Actions

  • Explain energy.
  • Explain amplitude.
  • Explain frequency.
4

Elaborate — Sound & Light

12 min

Apply.

👩‍🏫 Teacher Moves

  • Connect amplitude to loudness/brightness.
  • Connect frequency to pitch/color.
  • Compare two waves.

🎒 Student Actions

  • Connect to sound.
  • Connect to light.
  • Compare waves.
5

Evaluate — Exit Ticket

5 min

Three quick checks.

👩‍🏫 Teacher Moves

  • Hand out the exit ticket.
  • Look for wave properties.
  • Collect as formative data.

🎒 Student Actions

  • Label a wave.
  • Explain amplitude.
  • Explain frequency.
Standards Alignment

Built to the standards you report on

Aligned to Next Generation Science Standards and Common Core literacy. State-standard crosswalks available on request.

NGSS
MS-PS4-1

Use mathematical representations to describe a wave’s amplitude, wavelength, and frequency and their relationship to energy.

NGSS
MS-PS4-2

Develop a model to describe that waves are reflected, absorbed, or transmitted.

NGSS
MS-PS4-3

Integrate information to support that digital signals are a reliable way to encode information.

CCSS
RST.6-8.7

Integrate quantitative information with text in a model.

Differentiation

One lesson, every learner

Multilingual Learners

ELL / EMERGING READERS
  • Label a wave diagram.
  • Sentence frame: “More amplitude means more ___.”
  • Demo with a spring/rope.

Support & Access

IEP / 504
  • Focus on amplitude = height.
  • Use a labeled wave diagram.
  • Change one property at a time.

Stretch & Extend

GIFTED / EARLY FINISHERS
  • Compare transverse and longitudinal waves.
  • Calculate frequency from wavelength and speed.
  • Connect to the electromagnetic spectrum.
Materials

What to gather

  • 📽️Projector / board
  • 📓Science notebooks
  • 💻The Wave Tool
  • 🪝A spring/rope
  • ✏️Pencils
  • 🎫Exit-ticket slips
Vocabulary

Key terms — hover for a quick definition

wavea disturbance that carries energyamplitudethe height of a wave (its energy)wavelengththe distance between wave peaksfrequencyhow many waves pass per secondcrestthe top of a wavetroughthe bottom of a waveenergywhat a wave carriesmediumthe material a wave travels through
Evaluate

Exit Ticket

Preview the three formative checks. Tap “Sample answer” to see what mastery looks like — hide them before you print for students.

QUESTION 1
What does a wave carry from place to place?
Energy (not the matter it travels through).
QUESTION 2
What does a wave’s amplitude tell you?
How much energy it carries — bigger amplitude means more energy (louder sound, brighter light).
QUESTION 3
If a wave has a shorter wavelength, is its frequency higher or lower?
Higher — more waves pass by each second.

Going deeper? Transverse vs. longitudinal.

Have students model both a transverse wave (up-down, like light) and a longitudinal wave (push-pull, like sound) with a spring. A printable wave-lab sheet is in the Science library.

Study · Flashcards

Study the key terms

Tap a card to flip it, then rate whether you knew it. Built from this lesson’s vocabulary.

🃏 WavesFlip
Card 1
Term
Tap to flip →
Meaning
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Nice work!

Practice · Quiz

Check your understanding

A quick self-check with instant feedback, drawn from this lesson’s key terms.

📝 WavesQuiz
Score: 0
1 / 6
Question 1
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Practice · Worksheet

Printable worksheet

A print-and-go review sheet with a built-in answer key. Tap “Show answer key” to reveal answers, or print the clean version for students.

🖨️ WavesPrint
Name: ________________________
Date: ____________

Part A · Write the word that matches each meaning

Word bank: amplitude, crest, energy, frequency, medium, trough, wave, wavelength
  1. the height of a wave (its energy)
  2. what a wave carries
  3. the material a wave travels through
  4. a disturbance that carries energy
  5. the bottom of a wave
  6. the distance between wave peaks
  7. how many waves pass per second
  8. the top of a wave

Part B · Show what you learned

  1. What does a wave carry from place to place?
  2. What does a wave’s amplitude tell you?
  3. If a wave has a shorter wavelength, is its frequency higher or lower?
Answer key — Part A: 1) amplitude · 2) energy · 3) medium · 4) wave · 5) trough · 6) wavelength · 7) frequency · 8) crest
Part B: 1) Energy (not the matter it travels through). 2) How much energy it carries — bigger amplitude means more energy (louder sound, brighter light). 3) Higher — more waves pass by each second.