num_pages: 24
description: What would the world be life if we didn't have wheels? How do you think the ancient Egyptians moved huge stones to build the pyramids? Why does a mountain bike have such thick knobby tires? How do you think toys moved before batteries were invented? This title shows you how different kinds of these two simple machines are all around you to make your work and play easier.
language: English
title: Wheels and Cranks
titlecomplete: Wheels and Cranks (Simple Machines)
ratings_count: 2
publisher: Heinemann