Put levers to the test /
What do hammers, wheelbarrows, and brooms have in common? All of them are levers! Levers are simple machines. They help us to do jobs more easily. But don't take our word for it. Put levers to the test with the fun experiments you'll find in this book. As part of the Searchlight Books coll...
Minneapolis, MN :
Lerner Publications Co.,
|Series:||Searchlight books. How do simple machines work?
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