Simple machines (North Mankato, Minn.)

Readers learn how this simple machine makes it easier to move things to different levels. They learn how flatter slopes use less effort than steeper slopes. By the end of the book, readers know the difference between complex and simple machines and how inclined planes are used in everyday life to make lifting and lowering objects easier. How can we lift and lower things? How can we move heavy loads from one place to another? By using simple machines!...