Wedges (Simple Machines)

"Readers learn how this simple machine makes it easier to split things apart or stop them from moving. They learn how thicker wedges need more force to split something apart than thinner wedges. By the end of the book, readers know the difference between complex and simple machines and how wedges are used in everyday life to make work easier."--Publisher's website Presents a look at wedges, explaining how these simple machines work and describing some common examples, such as axes, that have been used throughout history. Tools and machines -- The work wedges do -- Split it -- Hold it open -- Thick or thin? -- Wedges everywhere.