Building Strong Structures

Lesson Overview

Grade Level: Year 3
Subject: Science
Time Duration: 10 minutes
Curriculum Standard: Ontario Science Curriculum – Understanding Structures and Mechanisms, Strong and Stable Structures

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Lesson Objectives

By the end of this lesson, students will be able to:

✅ Understand what structures are and identify examples of bridges and towers in everyday life.
✅ Recognise the importance of stability and strength in engineering.
✅ Identify different materials used to construct strong structures.
✅ Engage in discussion and share observations about engineering principles.

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Materials & Resources

• YouTube Video (pre-selected by the teacher) that showcases different types of bridges and towers
• Projector or interactive whiteboard
• A few small objects (e.g., books, plastic straws, LEGO blocks) to reference material properties
• Whiteboard and markers

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Lesson Breakdown

1. Introduction to Structures (2 minutes)

• Begin by asking students:
  "What do you think a structure is?"
• Give relatable examples: playground equipment, houses, and bridges they may have seen in their community.
• Introduce the two main types of structures for today’s lesson: bridges and towers.
• Ask: "Why are bridges important?" (Expected answers: Help us cross rivers, connect different locations.)
• Ask: "Why do we build towers?" (Expected answers: Tall buildings for people to live or work in, lookouts.)

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2. Watch the Video (3 minutes)

• Play a short YouTube video (pre-selected by the teacher).
• Encourage students to pay attention to:
  • The materials used in each structure.
  • The shapes and designs that make them strong.
  • Any examples of bridges or towers they recognise.

Tip: Pause briefly mid-video if needed to highlight key moments, such as how engineers test a bridge’s strength.

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3. Guided Discussion (3 minutes)

• Prompt #1: “What was your favourite structure in the video? Why?”

  • Allow students to describe and compare answers.

• Prompt #2: “What materials did you see used in the buildings? Which ones seem strongest?”

  • Guide them towards understanding that metal, concrete, and stone are common in stable structures.

• Prompt #3: “If you were designing a bridge, what would you make sure it had to be strong?”

  • Introduce concepts like triangles in bridge design, wide bases for balance, and using durable materials.

Engagement Activity: Hold up small objects like plastic straws vs. a book to illustrate material strength visually.

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Assessment & Wrap-Up (2 minutes)

• Ask for a volunteer to explain one thing they learned about structures today.
• End with a quick hands-up question:
  • “Who would like to build their own bridge or tower one day?”
  • “What material do you think is strongest for building?”
• Give students one fun fact: “The tallest tower in the world is the Burj Khalifa, which is 828 metres tall!”

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Teacher Notes & Next Steps

✅ If time permits, consider a hands-on follow-up activity in the next lesson (e.g., building a simple bridge with classroom materials).
✅ Link concepts from this lesson to real-world structures in your local area.
✅ Encourage students to observe bridges and towers when they go home and think about why they were built that way.

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Why Teachers Will Love This Lesson Plan

💡 Highly engaging – Uses a mix of video, discussion, and hands-on explorations.
💡 Easy to follow – Clear breakdown of steps, time management, and structured discussion prompts.
💡 Curriculum-aligned – Direct link to CA Ontario Science Curriculum outcomes.
💡 Short and impactful – Perfect for a mini-lesson before a larger hands-on project.

🚀 Ready to inspire the next generation of engineers? Let’s build strong structures together!