The job decides which test matters
Which material fits which job? The job decides.
Step 1 of 3
- Job: lamp flex, the cord of a lamp. Three materials to try: copper, pencil core, glass.
- The job needs two things: carries the loop (the circuit), and draws into wire.
- Copper passes both. It fits the job.
The rule
A property is a quality of a material, such as shine.
Start with the job. The right material passes both properties the job needs.
| The job | What it needs |
|---|---|
| Wire in a lamp's flex | Carries the loop, and draws thin |
| A bell for the school gate | Rings on, and survives a blow |
| Foil to wrap food | Beats out thin, and can be heated |
The pencil core carries the loop too. But it snaps at a tap. So it fits a pencil, not a lamp's flex.
Now try it. Read the job. Tap the material that fits.
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