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<title>W04 Monday - Flexible vs Rigid</title>
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<h1>🌀 Flexible or Rigid? The Bend Test</h1>
<h2>Week 4 • Monday • Flexible vs. Rigid Materials</h2>
<h3>📖 Reading Time</h3>
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<p>Some materials bend. Some do not. A material that bends easily is flexible. A rubber band is flexible. You can stretch it and bend it. It goes back to its shape.</p>
<p>A material that does not bend is rigid. Rigid means stiff. A brick is rigid. A glass cup is rigid too. If you push too hard on a rigid material, it may break instead of bending!</p>
<p>Scientists do a bend test to find out if a material is flexible. They gently bend the material and watch what happens. Does it bend? Does it snap back? Does it stay bent? Or does it break?</p>
<p>Both properties are useful. A jump rope must be flexible. A ladder must be rigid. Today you will do your own bend tests!</p>
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<h3>✏️ Reading Questions</h3>
<p>1. What do we call a material that bends easily?</p>
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<p>2. What does rigid mean?</p>
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<p>3. What can happen if you push too hard on a rigid material?</p>
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<p>4. Why must a ladder be rigid and not flexible?</p>
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<h3>📝 Vocabulary Grid</h3>
<p style="font-size:10.5px; color:#555;">Write what each word means in your own words.</p>
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<div class="vocab-card"><strong>flexible</strong><div class="line-row"></div><div class="line-row"></div></div>
<div class="vocab-card"><strong>rigid</strong><div class="line-row"></div><div class="line-row"></div></div>
<div class="vocab-card"><strong>bend</strong><div class="line-row"></div><div class="line-row"></div></div>
<div class="vocab-card"><strong>stiff</strong><div class="line-row"></div><div class="line-row"></div></div>
<div class="vocab-card"><strong>stretch</strong><div class="line-row"></div><div class="line-row"></div></div>
<div class="vocab-card"><strong>break</strong><div class="line-row"></div><div class="line-row"></div></div>
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<h3>📊 Sort It: Flexible or Rigid?</h3>
<p style="font-size:10.5px; color:#555;">Circle the answer for each object.</p>
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<tr><th>Object</th><th>Flexible or rigid?</th></tr>
<tr><td>A rubber band</td><td>FLEXIBLE / RIGID</td></tr>
<tr><td>A brick</td><td>FLEXIBLE / RIGID</td></tr>
<tr><td>A shoelace</td><td>FLEXIBLE / RIGID</td></tr>
<tr><td>A drinking glass</td><td>FLEXIBLE / RIGID</td></tr>
<tr><td>A garden hose</td><td>FLEXIBLE / RIGID</td></tr>
<tr><td>A wooden ruler</td><td>FLEXIBLE / RIGID</td></tr>
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<h3>✏️ True or False</h3>
<p style="font-size:10.5px; color:#555;">Write T for true or F for false in each circle.</p>
<div class="tf-item"><span class="circle-box"></span> Flexible materials bend easily.</div>
<div class="tf-item"><span class="circle-box"></span> Rigid means bendy.</div>
<div class="tf-item"><span class="circle-box"></span> A jump rope should be flexible.</div>
<div class="tf-item"><span class="circle-box"></span> Rigid materials can break if pushed too hard.</div>
<div class="tf-item"><span class="circle-box"></span> A rubber band stays bent after you let go.</div>
<div class="tf-item"><span class="circle-box"></span> A ladder should be rigid.</div>
<h3>🎨 Drawing: Flexible and Rigid</h3>
<p style="font-size:10.5px; color:#555;">Draw something flexible, something rigid, and something with both parts (like a shovel).</p>
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<h3>🧠 Think About It</h3>
<p>1. Why is a bike tire flexible but the bike frame rigid?</p>
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<h3>✏️ Fill in the Blanks</h3>
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<span>flexible</span><span>rigid</span><span>bend</span><span>break</span><span>stiff</span><span>test</span>
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<p>1. A material that bends easily is ______________ .</p>
<p>2. A material that does not bend is ______________ .</p>
<p>3. Rigid materials feel ______________ when you push them.</p>
<p>4. Scientists do a bend ______________ to check flexibility.</p>
<p>5. If you push a rigid material too hard, it might ______________ .</p>
<p>6. It is easy to ______________ a pipe cleaner into a circle.</p>
<h3>⚠️ Safety</h3>
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<p>Only bend safe things a grown-up gives you. Never bend glass or anything sharp. Wear shoes in case something snaps and drops.</p>
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<h3>🔬 Experiment: The Bend Test</h3>
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<p><strong>You need:</strong> a straw, a piece of paper, a rubber band, and a small dry stick or twig.</p>
<p>Gently bend each item. Watch closely. Circle what happens to each one.</p>
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<tr><th>Material</th><th>What happened when I bent it?</th></tr>
<tr><td>Straw</td><td>BENT / SNAPPED BACK / BROKE</td></tr>
<tr><td>Paper</td><td>BENT / SNAPPED BACK / BROKE</td></tr>
<tr><td>Rubber band</td><td>BENT / SNAPPED BACK / BROKE</td></tr>
<tr><td>Dry stick</td><td>BENT / SNAPPED BACK / BROKE</td></tr>
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<p>The most flexible material was: ______________________</p>
<p>The most rigid material was: ______________________</p>
<h3>🔬 Coming Up Wednesday</h3>
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<p>You will build a bridge and test which materials make it strong! Save your straws and paper.</p>
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<h3>📊 Review</h3>
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<tr><th>I learned...</th><th>Circle one</th></tr>
<tr><td>What flexible means</td><td>YES / NOT YET</td></tr>
<tr><td>What rigid means</td><td>YES / NOT YET</td></tr>
<tr><td>How to do a bend test</td><td>YES / NOT YET</td></tr>
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