Safe Boat Materials

Overview

In this second lesson of the 9-lesson unit “Designing Safe Boats,” students explore everyday materials and sort them as “hard” or “soft.” They learn that materials have observable properties and that choosing the right material helps a boat be safe and fit for purpose.

Learning intentions

• WALT (We Are Learning To…) identify observable properties of materials using the senses (where appropriate).
• WALT group materials into categories such as hard and soft based on their properties.
• WALT explain that objects are made from materials and that material choice affects what an object can do.

Success criteria

• I can describe what a material is like (for example, hard/soft, rough/smooth, flexible/not flexible).
• I can sort materials into hard and soft groups and tell why.
• I can name the material an everyday object is mainly made from.
• I can link a material property to how it might help a safe boat (fit for purpose).

Curriculum links

• Science: Materials and their properties — identifying observable properties using the five senses.
• Science: Materials and their properties — materials have observable properties (e.g. shape, texture, colour, hardness, flexibility).
• Science: Materials and their properties — comparing and grouping everyday materials based on shared physical properties.
• Science: Materials and their properties — identifying the primary material an object is made from.
• Key competencies: Thinking (sort and explain), Participating and contributing (work respectfully in a group), Relating to others (listen and share ideas), Using language, symbols, and texts (use simple property words).

Lesson structure (30 minutes)

1. 0–3 min · Hook (show and predict). Teacher shows two short “boat” samples: one made with a hard material (e.g., foam block or plastic lid) and one made with a soft material (e.g., sponge or fabric). Students do a quick think then share: “Which one could feel safer to hold and why?”

2. 3–10 min · Direct teach (what are materials like?). Teacher introduces the idea that materials have observable properties and models using five senses appropriately: look, touch, (and smell only if safe and teacher-approved), colour/texture, and whether it is hard or soft. Students handle one “mystery” item at their table and use a sentence starter: “I think this is hard/soft because…”

3. 10–16 min · Sorting activity (hard vs soft). Teacher gives each group a tray of materials (for example: cotton fabric, sponge, cardboard, plastic, rubber band, foam, wool, thin metal spoon if safe, paper). Teacher draws two large headings: HARD and SOFT, and asks students to place items and justify their choice using property words. Students sort, then do a 30-second gallery share (“Our group chose…”).

4. 16–22 min · Linking to boat design (safety and purpose). Teacher asks: “For a boat you might carry, splash, and hold—what materials could be safer and why?” Teacher prompts:

• If something is hard, could it hurt if it bumps?
• If something is soft, could it bend or grip?
• What should a boat feel like for the person using it? Students in pairs choose one hard and one soft material card, then complete: “I choose __ for the boat because it is __, so it helps with __ (holding safely / not poking / comfort / grip).”

5. 22–27 min · Object match (what is it made from?). Teacher shows 4–6 familiar items (for example: a wooden pencil, plastic bottle lid, fabric sock, paper towel, metal spoon, foam craft piece). Students take turns matching each object to the correct primary material category (wood, plastic, fabric, paper, metal, foam). Students explain one property they noticed.

6. 27–30 min · Exit ticket (check understanding). Each student completes a quick “Hard or soft?” card: draw one material they saw today and write one sentence: “This is __ because __.” Collect for formative assessment.

Resources

• Material trays for 5 groups (assorted hard and soft items)
• Large classroom sorting labels: HARD / SOFT
• Material property word prompts on a display (hard, soft, rough, smooth, flexible, not flexible)
• Object picture cards (or real objects) to match primary material
• Sentence starter strips (for example: “I think it is hard/soft because…”, “I choose __ because…”)
• Exit ticket cards and pencils
• Safety reminders: handle carefully, keep materials at the desk, wash hands after handling

Assessment

• Teacher observation during sorting: are students using correct property words and giving reasons?
• Pair discussions during the boat design link: can students connect a property to safety or purpose?
• Exit ticket: can students accurately describe a material property using a complete sentence?

Differentiation

• Support: provide word bank and sentence starters; allow students to sort using only two properties first (hard/soft) before adding texture words.
• Support: use a smaller set of materials for students who need it; check understanding with one-to-one prompts.
• Extension: ask “What might be harder to use for a safe boat part, and what could you change (cover it, combine materials)?”
• EAL/SEN: accept non-verbal justification (point to property, show “hard/soft” hand gestures) and gradually build to full sentences; partner with a supportive peer for speaking frames.