There's a good ball bearing activity in this book. - Vollis Simple machines Levers Gears Machine experiments Machines by Janice VanCleave Published by John Wiley & Sons, Inc. ISBN 0-471-57108-3 Summary: A collection of science projects and experiments exploring simple machines as levers and screws. For more literature and science connections browse through other Books you can use. How is your forearm like a lever? What makes it easy to pull a flag up a flagpole? How can a windmill help to do work? Pneumatic powered projects Whirlygig in a box Friction free?

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