Buddy books. Simple machines
Author
2) Pulleys
Author
Series
Pub. Date
©2007
Accelerated Reader
IL: LG - BL: 3.8 - AR Pts: 1
Description
An introduction to pulleys that describes their parts, functions, uses, and history.
4) Wedges
Author
Series
Pub. Date
℗♭2007
Accelerated Reader
IL: LG - BL: 3.7 - AR Pts: 1
Description
Shows how wedges make pushing, pulling apart and lifting easier.