Simple Machines

Simple Machines

by Dana Meachen Rau

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Overview

How did workers in ancient civilizations move the huge stones they used to build cities?

They rolled the stones over logs much like a modern-day conveyor belt.

Inside, You'll Find:

How humans have used simple machines throughout history;

A timeline, photos-and how simple machines can be combined to do different jobs;

Surprising True facts that will shock and amaze you!

Product Details

ISBN-13: 9780531265864
Publisher: Scholastic Library Publishing
Publication date: 09/01/2011
Series: Scholastic True Book Series: Physical Science
Pages: 48
Sales rank: 774,872
Product dimensions: 6.90(w) x 8.20(h) x 0.20(d)
Age Range: 7 - 9 Years

Table of Contents

1 Easy Does It

How do simple machines make work easier? 7

2 Getting Around

How do wheels and pulleys work? 15

3 Lift and Lower

How do levers move loads? 23

So Many Simple Machines!

Can you find simple machines at an amusement park? 28

4 Ramp it Up

How do inclined planes help raise objects higher? 31

5 Break Apart and Hold Together

How do wedges and screws convert forces? 35

True Statistics 43

Resources 44

Important Words 46

Index 47

About the Author 48

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