What Do Pulleys and Gears Do? (What do... do?)

by David Glover (Author)

• Used

  Hardcover
  1996

  $6.05

• Used

  Hardcover
  2006

  $3.35

  This series develops children's knowledge of the basic principles of design and technology. Each book introduces a particular principle and then explored how it is used in different and increasingly complex gadgets and machines. Artwork and photographs help to explain the workings of machines. New activity spread allows children to investigate the principles for themselves. Fresh new design and eye-catching fact boxes motivate young readers.