Machines: Simple and Compound by National Geographic Learning, Rebecca L. Johnson
Machines: Simple and Compound

National Geographic Learning, Rebecca L. Johnson

Machines: Simple and Compound

National Geographic Learning, Rebecca L. Johnson

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"Examine how machines make work easier by exploring simple and compound machines. Discover the parts of a bicycle to learn how this compound machine helped Lance Armstrong pedal his way to seven Tour de France victories"--Publisher's website.

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