How things work
Why does a rubber ball bounce? When a rubber ball hits a hard surface it flattens the rubber and squeezes the air inside the ball. The air inside then tries to push the rubber back to its original…
- ویرایش
- -
- شابک/شاپا
- 0809472791
- مجموعه
- 87 pages : illustration ; 30 cm
- عنوان فروست
- A child,s library of learning
- شماره بازیابی
- 621 HOW
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