Simple machines
Publisher: Harcourt School Publishers
Published: 2005
Place of publication: Orlando, [Florida]
Language: eng
Number of pages: 20
ISBN-13: 9780153438653; 9780153620522
Subjects: Machinery; Juvenile literature
Table of contents: title: How do simple machines help people do work?; title: How do a pulley and a wheel-and-axle help people do work?; title: How do other simple machines help people do work?