You have finished four weeks of materials science! You learned to observe like a scientist. You learned about properties like texture and hardness. This week you learned about flexible and rigid materials.
Remember the big ideas. Flexible materials bend without breaking. Rigid materials stay stiff and hold their shape. Pushing too hard on a rigid material can crack or break it. Engineers pick flexible or rigid materials to match the job.
Look around and you will see both everywhere. Your shoes bend when you walk. Your chair stays rigid when you sit. Your world is built from smart material choices. Today you will play a game, take a quiz, and build one last design!
1. What do flexible materials do?
2. What can happen when you push too hard on a rigid material?
3. Why do your shoes need to bend?
4. Name one flexible thing and one rigid thing in your room. Tell why each is made that way.
Imagine bending each item. Circle BENDS or BREAKS.
| Item | If you bend it hard, it... |
|---|---|
| A pipe cleaner | BENDS / BREAKS |
| A dry spaghetti noodle | BENDS / BREAKS |
| A wet noodle | BENDS / BREAKS |
| A thin twig | BENDS / BREAKS |
| A rubber eraser | BENDS / BREAKS |
| A candy cane | BENDS / BREAKS |
Write T for true or F for false in each circle.
1. A jump rope must be ______________ .
2. A ladder must be ______________ .
3. An ______________ designs and builds things.
4. Flexibility is a ______________ of a material.
5. Scientists ______________ carefully before deciding.
6. Pipe cleaners are easy to ______________ .
Build the most flexible structure you can! Use pipe cleaners, straws, paper, or string. It should bend without breaking when you push it. Then draw your design below.
Materials I used: ______________________________________
When I pushed it, my structure:
Write today's date in your journal. Then finish these sentences:
The most fun thing I did in the last four weeks was:
| Skill | How did I do? Circle one |
|---|---|
| I can tell flexible from rigid. | GREAT / OK / NEED PRACTICE |
| I can do a bend test. | GREAT / OK / NEED PRACTICE |
| I can build and test a bridge. | GREAT / OK / NEED PRACTICE |
| I can pick materials for a job. | GREAT / OK / NEED PRACTICE |
Congratulations, materials scientist! Show someone at home your favorite worksheet from the past four weeks. Teach them one thing you learned about materials.