Energy Foundations

Overview

This first lesson in the “Energy in Physical Systems” unit introduces energy as a way to describe and predict changes in physical systems. Students build shared vocabulary and practise linking system changes to evidence-based energy ideas.

Learning intentions

• Students will be able to define energy as a concept used to explain change in physical systems.
• Students will describe a physical system and a change to it using evidence.
• Students will identify relevant energy concepts (energy transfer, conservation, and forms such as thermal/mechanical/electrical) that could explain the change.

Success criteria

• I can describe a physical system as a defined space with interacting objects.
• I can describe a change in that system using observable evidence.
• I can name relevant energy concepts and link them to the change using evidence.
• I can use scientific language accurately (e.g., system, transfer, forms of energy, conservation).

Curriculum links

• AS92047 — Demonstrate understanding of a physical system using energy concepts (describe system, describe change using evidence, describe relevant energy concepts using evidence).
• Science core achievement language: energy concepts include energy transfer, conservation of energy, and forms of energy (mechanical, thermal, electrical).
• Practices within the NZ Curriculum: using scientific ideas to explain observations and represent thinking clearly.

Lesson structure (50 minutes)

1. 0–5 min · Hook: “What does energy do?”

• Teacher demonstrates a simple scenario (e.g., warm water in a flask placed on a bench then compared to room-temperature water).
• Students quick-write: “Where did the energy go?” and “What evidence do I have?” (no full answers yet).

2. 5–12 min · Direct teach: Energy as an explanatory tool

• Teacher explains: energy is not something you usually “see”, but you can use it to explain changes in systems; introduce energy transfer and conservation as key ideas for later lessons.
• Students take notes using a template: “Energy concept → What it helps explain → Example from today”.

3. 12–22 min · Guided model: System + change + energy concept

• Teacher models one worked example on the board:
• Physical system: the water inside the flask (defined space).
• Change: temperature increases/decreases (measured or observed evidence).
• Energy concepts: energy transfer (from warmer to cooler), forms (thermal), conservation (total energy tracked within the system + surroundings).
• Students do a short think–pair–share to add: “Which energy transfer direction makes sense and why?”

4. 22–35 min · Investigation-style discussion stations (evidence focus, no lab setup)

• Teacher assigns 3 stations with scenario cards (one per group of ~8–9):
• Station A: kettle heating water (thermal energy increase).
• Station B: electrical circuit lighting an LED (electrical to light/thermal).
• Station C: ball falling to the floor (mechanical energy change to thermal at impact).
• Students rotate through stations, completing a “system–change–energy ideas” table using only evidence provided on the card (temperatures, brightness observations, motion descriptions, or simple values shown).
• Teacher circulates to check students include evidence and link to at least one energy concept.

5. 35–45 min · Whole-class synthesis: building an “energy explanation chain”

• Teacher draws a chain diagram: System → Change → Evidence → Energy concept(s) → What this suggests.
• Students volunteer one idea from each station; teacher compacts answers into a class anchor chart.

6. 45–50 min · Exit ticket: assess understanding

• Teacher gives an exit ticket with one new scenario (short and familiar).
• Students respond in 4–5 sentences or a mini-table: define the system, describe the change with evidence, and name one energy concept with a linked explanation.

Resources

• Teacher demo materials (e.g., insulated flask or warm/cool water comparison, thermometer if available, paper towels)
• Scenario cards for stations (3 sets)
• System–change–energy table template (one per student)
• Board/slide or poster for the energy explanation chain
• Exit ticket slips
• Markers and sticky notes for anchor chart contributions

Assessment

• Formative checks during guided modelling: listen for accurate use of “system”, “change”, and evidence-based claims.
• Station table review: confirm each group links a change to at least one relevant energy concept and includes evidence.
• Exit ticket: verify students can meet AS92047 “demonstrate understanding” elements (system description, change with evidence, energy concepts with evidence).

Differentiation

• Support:
• Provide sentence starters for the exit ticket and station tables (e.g., “The physical system is…”, “The change is… because…”, “This suggests energy is transferred as…”.)
• Offer a word bank: system, surroundings, transfer, thermal, electrical, mechanical, conservation, evidence.
• Extension:
• Challenge students to include a second energy form or explicitly state why conservation of energy applies (without full calculations yet).
• EAL/SEN:
• Allow responses using diagrams + short sentences; highlight key terms on a class word wall.
• Pair students strategically for station work (one confident speaker + one note-taker, then swap roles).