The Big Ideas! Simple machines can change the size and direction of forces. Simple machines make work easier for us by letting us push or pull over increased distances.
Books of Science! "The Science Book of Machines" by Neil Ardley. Published by Gulliver Books, 1992. "The Way Things Work" by David Macaulay. Published by Houghton Mifflin Company, 1988.
Did You Know That? The great pyramids in Egypt were built using earthen ramps? You have to use at least two pulleys to lower a pulling force? Complex machines are usually a combination of simple machines?
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