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Get to know levers /
All people have jobs to do. Some jobs take a lot of energy. Simple machines help people get jobs done without working too hard. There are six kinds of simple machines: inclined planes, levers, pulleys, wedges, screws, and wheels and axles.
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| Format: | Online Book |
| Language: | English |
| Published: |
New York, NY :
Crabtree Pub. Company,
2009.
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| Series: | Get to know simple machines.
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| Subjects: | |
| Access: | Online version |
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