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Lesson 1: Beach Chair

Essential Question: How can a simple frame hold weight without collapsing?

What You'll Build: A chair using beams and connectors that must stand on its own and hold weight.

Concept Preview: You'll discover why some frames stay strong and others collapse — it's all about the base and the joints.

🔍 What to Look For During the Build

How does the width of the base affect balance?
Which joints are the weakest?
Does the chair wobble when you push it?

Build → Learn Link: While building, pay attention to which joints feel loose. In Learn, you'll find out exactly why tight joints and wide bases make structures stable.

Key Concepts: frame stability · base support · joint connections

Core Idea: Frame stability

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📋 Teacher Prep

Sort beach chair frame parts. Show a real folding chair or image. Discuss what 'stable' means — can it stand on its own?

🔨 What happened in this build?

You built a Beach Chair using beams and connectors. The chair needed a strong frame so it could hold weight without falling over.

💡 Core Idea

Frame stability — a structure stays upright when its base is wide enough and its joints are tight.

⚙️ Why does it work?

The base beams spread the load sideways. Tight joints stop the frame from wobbling. If the base is too narrow or joints are loose, the chair tips over.

📖 Important Words

Frame: The skeleton of a structure that holds everything together.
Base support: The bottom part that touches the ground and keeps the model stable.
Joint: The place where two parts connect. Tight joints = strong model.

⚠️ Watch Out!

Some students think a taller chair is always better. But if the base stays small and the chair gets taller, it tips over more easily.

✏️ Practice Before Quiz

What happens if you make the base of the chair narrower? (It becomes less stable.)
Name one thing you can do to stop the chair from wobbling. (Tighten the joints.)
Which part of the chair touches the ground and keeps it upright? (The base.)

🎯 Ready for Quiz?

You should know: what a frame is, why the base matters, and what happens when joints are loose.