Screws Keep Things Secure: Simple Machines for Kids

*Selected as a 'recommended title' by the Kansas National Education Association's Reading Circle Commission Learn how simple machines make work easier in these colorful nonfiction picture books all about science and engineering If you were building a tree house, what could you use to keep the boards together? You could use nails, but you might also use screws. Screws are one of the simple machines that are designed to make different kinds of work easier Lifting, pulling, pushing, and fastening things together-all these tasks are more efficient when you use a simple machine. In Screws Keep Things Secure: Simple Machines for Kids, readers ages 5 to 8 learn how a screw's shape can pull things together or push things apart or even move heavy objects from one place to another Scientific concepts including forces and mechanical advantage come clear with engaging illustrations and lots of real-life examples that kids can spot in their home, schools, and neighborhoods. An introductory poem