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<title>W04 Wednesday - Flexible Bridge Challenge</title>
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<h1>🌉 Build a Bridge Challenge</h1>
<h2>Week 4 • Wednesday • Flexible vs. Rigid Materials</h2>
<h3>📖 Reading Time</h3>
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<p>Engineers are people who design and build things. They build bridges, buildings, and machines. Engineers must pick the right materials for every job.</p>
<p>A bridge needs to hold weight without falling. Most bridge parts are rigid so they stay strong and straight. But some bridges have flexible parts too! Flexible parts let a bridge move a little in strong wind. A little bending can stop a big break.</p>
<p>Today you are the engineer. You will build a small bridge between two books. You will test different materials. Which material holds the most weight? Make a guess, test it, and record what happens. That is exactly what real engineers do!</p>
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<h3>✏️ Quick Questions</h3>
<p>1. What does an engineer do?</p>
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<p>2. Why do some bridges have flexible parts?</p>
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<h3>⚠️ Safety</h3>
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<p>Ask a grown-up for help gathering materials. Use only light weights like coins or blocks. Keep small items away from little brothers and sisters.</p>
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<h3>🔬 Experiment: Bridge Building Setup</h3>
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<p><strong>You need:</strong> two stacks of books, paper, straws, cardboard, and coins for weights.</p>
<p><strong>Steps:</strong> 1. Put the book stacks about 6 inches apart. 2. Lay one material across the gap like a bridge. 3. Add coins one at a time to the middle. 4. Count how many coins it holds before it bends down and drops them!</p>
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<p>My guess: the strongest bridge material will be ______________________ .</p>
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<h3>📊 Data: Bridge Test Results</h3>
<p style="font-size:10.5px; color:#555;">Test each material. Record your results.</p>
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<tr><th>Bridge material</th><th>How many coins did it hold?</th><th>Flexible or rigid?</th><th>Did it bend a lot?</th></tr>
<tr><td>One sheet of paper</td><td></td><td></td><td>YES / NO</td></tr>
<tr><td>Folded paper (fan folds)</td><td></td><td></td><td>YES / NO</td></tr>
<tr><td>Straws side by side</td><td></td><td></td><td>YES / NO</td></tr>
<tr><td>Cardboard</td><td></td><td></td><td>YES / NO</td></tr>
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<h3>📊 Math Connection: Coin Count</h3>
<p>1. Which bridge held the most coins? ______________________</p>
<p>2. Which bridge held the fewest coins? ______________________</p>
<p>3. How many more coins did the strongest hold than the weakest? __________</p>
<h3>📊 Sort It: Was My Guess Right?</h3>
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<tr><th>Question</th><th>My answer</th></tr>
<tr><td>What was my guess?</td><td></td></tr>
<tr><td>What really won?</td><td></td></tr>
<tr><td>Was my guess right?</td><td>YES / NO</td></tr>
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<h3>🎨 Drawing: My Best Bridge</h3>
<p style="font-size:10.5px; color:#555;">Draw your strongest bridge with the coins on top. Label the material.</p>
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<h3>✏️ Extended Writing: Engineer's Report</h3>
<p>Why do you think the winning material held the most coins? Use the words rigid or flexible in your answer.</p>
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<h3>🧠 Challenge: Make It Stronger</h3>
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<p>Pick your weakest bridge material. Can you make it stronger? Try folding it, rolling it, or doubling it. Test it again!</p>
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<p>What I changed: ______________________________________</p>
<p>Coins it held before: __________ Coins it held after: __________</p>
<p>Did my change work? YES / NO</p>
<h3>📓 Science Journal</h3>
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<p>Write today's date in your journal. Then finish these sentences:</p>
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<p>Today I built bridges out of ______________________________.</p>
<p>One thing I would try next time is:</p>
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<h3>🏠 Home Activity</h3>
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<p>Look for a real bridge when you ride in the car. What material is it made of? Tell a grown-up if you think it is rigid, flexible, or both!</p>
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