What do you know about simple machines?
By: Tilda Monroe.
Edition: 1st ed.
Series: 20 questions. Physical science
Publisher: PowerKids Press
Published: 2011
Place of publication: New York
Language: eng
ISBN-13: 9781448806744; 9781448812578; 9781448812585
Subjects: Simple machines -- Juvenile literature
Genres: Juvenile literature
Notes: Includes index.
Table of contents: title: What is work?; title: How common are simple machines?; title: What is a lever?; title: What does a lever do?; title: Is a seesaw a lever?; title: Are the wheels on my bike a simple machine?; title: How do we use wheels and axles?; title: What is a pulley?; title: How does it work?; title: Why do we need pulleys?; title: Is a ramp a simple machine?; title: What kind of work does an inclined plane help us do?; title: Are there other kinds of inclined planes?; title: Is doorstop a wedge?; title: What are some other wedges?; title: What kind of simple machine is a screw?; title: How does a screw work?; title: Are there other simple kinds of machines?; title: How long have people been using simple machines?; title: Do we still need simple machines today?