Thermal Energy Transfers

Overview

This lesson helps students understand thermal energy more deeply by exploring how heat moves from warmer to cooler objects and why different materials transfer thermal energy differently. Students will link everyday examples (hot frying pan, ice in water, glowing bulbs) to a clear explanation of thermal energy transfer and the evidence they would collect.

Learning intentions

• WALT explain that thermal energy moves from warmer objects to cooler objects.
• WALT use evidence from observations (e.g., temperature change, melting rate) to support claims about heat transfer.
• WALT distinguish, with examples, how thermal energy can transfer through different processes (conduction, convection, radiation).
• WALT describe common sources of thermal energy (such as the Sun, fire, friction, and electricity) and relate them to heating and cooling in daily life.

Success criteria

• I can explain in my own words how thermal energy moves from warm to cool objects.
• I can give an example and describe what evidence would show that thermal energy transfer is happening.
• I can classify everyday examples as showing conduction, convection, or radiation (with a reason).
• I can support my explanation with observations from a simple investigation or demonstration.

Curriculum links

• Te Mātaiaho Science — Physical Science / Heat: Applying the movement of thermal energy from warmer objects to cooler objects to everyday examples and using evidence to demonstrate transfer.
• Te Mātaiaho Science — Physical Science / Thermal energy: Classifying examples of thermal energy transfer and explaining conduction, convection, and radiation in heating and cooling contexts.
• Te Mātaiaho Science — Physical Science / Interactions and Energy — Heat: Thermal energy comes from many sources (the Sun, fire, friction, electricity).
• Te Mātaiaho Science — Physical Science / Heat: Exploring how light-emitting objects also release thermal energy (LED and incandescent bulbs).

Lesson structure (60 minutes)

1. 0–8 min · Hook and model idea Teacher shows a short scenario: “Your hand feels heat when you touch a metal spoon that has been in hot water—why?” Students turn and talk, then share their first explanation ideas.

2. 8–18 min · Direct teaching: what thermal energy really is Teacher explains thermal energy as energy associated with temperature, and focuses on transfer (not “heat as a substance”). Teacher uses a diagram: warm particles transfer energy to cool particles, changing temperatures over time. Students complete a quick “Claim–Evidence” prompt: identify what they could measure to show transfer is happening.

3. 18–28 min · Demonstration stations (more explanations) Teacher runs three quick stations with short guidance:

• Station A (conduction): metal vs plastic spoon handles placed in hot water for a timed check of temperature change (or “how fast you can feel warmth”).
• Station B (convection): warm water “colour trail” rises/falls using food colouring in hot and cool water containers.
• Station C (radiation): shine a lamp at two surfaces; compare temperature/feel after a short time. Students record: what changed, how fast, and which process seems most likely.

4. 28–44 min · Small investigation: ice in a warm container Teacher sets up a hands-on investigation with evidence: ice cubes placed in equal cups with the same starting conditions, then measured at intervals (time to partially melt, or approximate water height/temperature change if available). Students work in groups of 3–5, measuring and recording. Teacher prompts students with guiding questions:

• What is warmer and what is cooler?
• What evidence tells us energy is moving?
• What could slow or speed the transfer (surface area, stirring, container material)?

5. 44–54 min · Students construct explanations Using their station notes and ice investigation data, students write a short scientific explanation: “Thermal energy transfers from warmer to cooler objects because…” They must include:

• one claim
• one piece of evidence from observations
• one reasoning sentence linking to conduction/convection/radiation (or “a mix of processes”) Teacher circulates and supplies sentence starters as needed.

6. 54–60 min · Exit ticket and quick share-out Students answer three questions independently:

• Describe one everyday example and identify the transfer process.
• What evidence would you collect to prove thermal energy is transferring?
• Explain why touching a metal object can feel faster than touching a wooden/plastic one.

Resources

• 3–5 temperature probes or thermometer sets (or timed “warm to touch” qualitative markers)
• Containers for hot and cool water (insulated if possible), kettle or hot water source with safety controls
• Metal and plastic spoons (or spoon handles) plus heatproof gloves for teacher handling
• Food colouring, droppers
• Lamps or torches for radiation demonstration, or bright heat lamp if available
• Ice cubes, measuring jugs/cups, paper towels, timers
• Lab record sheets (tables for time/evidence)
• Safety glasses for students, heatproof gloves for teacher
• Projector/board for model diagram and sentence starters

Assessment

• Formative during stations: teacher checks students’ process labels and justifications (“Which process fits and why?”).
• Formative during investigation: teacher reviews group data tables for completeness and proper measurement recording.
• Exit ticket for individual understanding of (1) transfer direction, (2) evidence, and (3) process classification.

Differentiation

• Support: provide sentence starters for the explanation (e.g., “Thermal energy moves from… because…”; “Evidence shows… since…”).
• Support: offer a simplified classification grid with icons for conduction, convection, radiation.
• Challenge: ask students to compare two materials in their data and propose a reason for different transfer rates using evidence.
• EAL/SEN: allow oral rehearsal with a partner before writing; accept qualitative evidence wording as long as it is tied to observations.

Extension

• N/A (not requested).