Interactive Wave Models

Overview

Students construct and test interactive wave models using physical materials and PhET simulations, focusing on wave properties and wave behaviours. They then communicate their findings using scientific language and evidence, aligning with the unit “Exploring the World of Waves”.

Learning intentions

• Students will identify key properties of waves (e.g. amplitude, wavelength, frequency/period, and wave speed) in real demonstrations and simulations.
• Students will explain how changes in conditions affect wave behaviour (e.g. reflection, refraction, superposition).
• Students will design and run a simple “virtual experiment” to collect evidence from a PhET wave simulation.
• Students will communicate a scientific explanation to a specific audience using evidence and correct terminology.

Success criteria

• I can describe what amplitude and wavelength represent and where to measure them.
• I can use wave language to predict how changing one variable affects another observable feature.
• I can justify a claim using evidence from my physical model and/or the simulation results.
• I can present my model and explanation clearly to peers using appropriate scientific terms.

Curriculum links

• PY-11-02 — Students explain the properties and behaviours of waves.
• PY-11-WS-07 — Students communicate scientific arguments using evidence, scientific language and terminology for a specific audience.
• Focus on wave properties and behaviours through physical and digital models.

Lesson structure (45 minutes)

1. 0–5 min · Starter: “What changes the wave?” Teacher displays two quick prompts on the board: “If amplitude increases, what changes?” and “If wavelength decreases, what might change about frequency or speed (depending on the medium)?” Students do a quick think-write, then share one idea with a partner.

2. 5–12 min · Model setup briefing (stations + roles) Teacher introduces today’s task: teams build an interactive physical wave model and pair it with a PhET simulation for a matching behaviour. Students receive a roles card (Builder, Simulation driver, Data recorder, Presenter) and confirm which wave behaviour they will focus on (teacher pre-assigns to ensure coverage).

3. 12–25 min · Physical model build + first test Teacher circulates while students construct a simple wave demonstration (e.g. rope/slinky for transverse waves; ripple tank substitutes or a spring/“pulse” method depending on available materials). Students test one variable change at a time (amplitude or pulse frequency; and, where possible, wave speed by changing how pulses are produced) and record observations in a table: variable changed → what stayed the same → what changed.

4. 25–34 min · Virtual experiment design (PhET) + data capture Teacher models how to set up a simulation to match the physical model, emphasizing controlled variables and consistent measurement. Students run a brief virtual experiment in PhET (2–3 trials): measure or estimate wavelength and amplitude, note frequency/period or cycle rate, and record evidence aligned to their claim.

5. 34–41 min · Collaborative presentation build (evidence argument) Teacher provides a short presentation scaffold:

• Claim (what happens to the wave behaviour)
• Evidence (from physical model and/or PhET measurements)
• Explanation (use wave terminology and cause-effect reasoning) Students create a 1-slide or poster-style summary (paper or digital) and rehearse a 60–90 second explanation.

6. 41–45 min · Gallery share + exit evidence check Teacher runs rapid “gallery talks” (2 teams per minute) while the rest listen using a checklist: Were the wave properties named? Was there evidence? Was the explanation accurate? Students complete a 2–3 question exit ticket on paper or in a class form: one identification (amplitude/wavelength), one behaviour prediction (what changes and what does not), and one evidence statement (“My evidence shows…”).

Resources

• Physical wave materials (choose based on availability): slinky/spring, rope, metre rule, markers, string, stopwatch/phone timer
• Wave model recording sheets (table for variable → observations → measurements)
• Laptops/tablets with PhET simulations installed or accessed offline
• Student role cards (Builder, Simulation driver, Data recorder, Presenter)
• Presentation scaffold sheet (Claim–Evidence–Explanation prompts)
• Gallery checklist for peer feedback
• Exit ticket slips

Assessment

• Formative during stations: teacher checks that students use correct terminology when describing properties (amplitude, wavelength, frequency/period, wave speed).
• Formative through data review: teacher verifies that students changed one variable at a time and recorded measurable observations from both physical and simulation evidence.
• Exit ticket: assesses individual understanding of wave properties and the ability to link behaviour to evidence with appropriate language.

Differentiation

• Support: provide sentence starters for C–E–E (“I claim that… because…”, “In the simulation, wavelength was…, so…”), and a mini “how to measure wavelength” diagram.
• Support for students needing structure: assign a limited set of simulation parameters and provide a measurement guide (e.g. where to read amplitude and wavelength).
• Extension: challenge teams to compare two behaviours (e.g. reflection vs refraction) using the same evidence format, and to justify any differences with reasoning about medium and boundary conditions.
• EAL/SEN considerations: allow oral rehearsal before writing, and permit annotated diagrams (labels on amplitude and wavelength) to support claims.

Optional PhET Focus Choices (teacher selects to match equipment)

• Transverse wave pulse: amplitude vs wavelength and how frequency affects the pattern.
• Reflection at a boundary: what stays consistent and what changes at the interface.
• Superposition: adding two waves and describing resultant amplitude.