Simple machines /
"Machines help make work easier, like when you need to lift something heavy or reach way up high. There are six simple machines: the lever, the wheel and axle, the pulley, the ramp, the wedge, and the screw. Can you adjust a seesaw to lift an elephant? What happens when you combine two or more...
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| Format: | Book |
| Language: | English |
| Published: |
New York, NY :
Harper, an imprint of HarperCollins Publishers,
2015.
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| Series: | Let's-read-and-find-out science.
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| Subjects: |