Pulleys
Readers learn all about pulleys-the simple machines that help lift heavy objects. Pulleys are also, used to change the direction of a pulling motion. If you've sent a flag up a flagpole, you've used a pulley. The science behind pulleys is, explained through accessible text, including a hel...
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| Format: | EBOOK |
| Language: | ENGLISH |
| Published: |
Gareth Stevens Publishing LLLP
2013
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| Series: | GS leveled reader. Science |
| Subjects: |