Sloping up and down : the inclined plane (Robotx get help from simple machines)
by Law, Felicia (Author), Bailey, Gerry, 1945- (Author)
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Table of Contents:
- The robots' workshop
- The story of Sisyphus
- Ramps
- Pyramid ramps
- Higher and higher
- Robbo's science workshop
- Stairs and steps
- The escalator
- The marble run.