Simple machines
56 books
Moving heavy things
What Is a Pulley? (Welcome Books)
Simple Machines
Fred Flintstone's adventures with screws
Fred Flintstone's adventures with wheels and axles
Machines in the home
Inclined planes
Fred Flintstone's adventures with pulleys
The Lego Technic Idea Book
Simple Machines
Work & Simple Machines (Science Factory)
Simple machines
How Wheels And Axles Work
Levers
Simple machines and how they work
Explore Simple Machines
How things work
Simple machines made simple
Amazing Machines (Design Challenge)
Levers (Useful Machines)
What Do Pulleys and Gears Do? (What Do... Do?)
Using Machines
Bathtubs, Slides, Roller Coaster Rails
Wedges
Simple machines
Simple machines
Machines
Ramps and Wedges (Useful Machines)
Machines we use
