Screws

By Angela Royston

Book Overview

Why is a spiral staircase easier to climb? How can a screw lift a heavy car? What is a propeller for? Screws have been sued for over 2,000 years as a simple machine that can make other machines work.... This description may be from another edition of this product.

• Format: Hardcover
• Language: English
• ISBN: 1575723220
• ISBN13: 9781575723228
• Release Date: October 2000
• Publisher: Heinemann Educational Books
• Length: 32 Pages
• Weight: 0.80 lbs.
• Dimensions: 0.4" x 7.8" x 10.6"
• Age Range: 8 to 10 years
• Grade Range: Grades 3 to 5