Lesson 6 of 10
Choosing the right material
Show on a big screenA window, a knife, a raincoat. Why is each one made of a different material?
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The idea
A window must be clear. A knife must be hard. A raincoat must not soak up water. So each job needs a different material.
Property — what a material is like, such as hard or clear. The right material has the property the job needs.
| Job | Must be | Good material |
|---|---|---|
| Window pane | Transparent | Glass |
| Door | Opaque and strong | Wood |
| Knife blade | Hard | Steel |
| Raincoat | Does not soak up water | Plastic |
Step 1 of 4
- Three jobs: a window, a knife, a raincoat.
- Window: glass.
- Knife: steel.
- Raincoat: plastic.
Try the lab to finish this lesson.