Roll, Slope and Slide - A book about ramps by Michael Dahl is great. I LOVE his books. He has a whole series of books on simple machines and they are all beautiful and clear in their language and illustrations (which he did not do - that was Denis Shea).
The book clearly explains ramps and how they make work easier - and that is job of any simple machine.
4.5/5 stars.
Oh, and Dahl lives in a haunted house.
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