Explains the development of the wheel and shows how wheels are used in various everyday objects.
This book describes the work of six simple machines: pulley, lever, screw, wedge, inclined plane, wheel, and axle.
Students learn about simple and compound machines as they design a new playground that all children can use.
Mr. and Mrs. Fix-It are trying to start their own repair business but keep getting interrupted by neighbors' requests for help.
6 copies of Machines Help Us Do Work Concept Book. People develop and use machines to meet specific needs, they make work easier