"Describes how simple machines are used in construction and how they make work easier. Includes experiments"--Provided by publisher.
Describes and compares the four kinds of simple machines, levers, pulleys, wheels, and ramps.
An introduction to simple machines we use every day.
A very basic introduction to screws, levers, planes and more.
A staple of library collections since the 1950s, the new A True Book series is the definitive nonfiction series for elementary school readers.
Learn about a kind of wheel called a gear. Discover how wheels can be used to measure lengths. This book describes what wheels are and how they work, different types of wheels and their uses, and other facts about wheels.
There are wheels all around us-from the wheels on a bicycle to the steering wheel in a car. But how do wheels work, and why do we use them?