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Physical Science

Reading Levels These books contain three developmentally appropriate reading levels for each grade span.

Low
Mid
High

Each level of the book conveys similar concepts, images, and vocabulary.

Machines

© taden/iStock/Thinkstock

Machines

Simple and complex machines help us do work with less force, or effort. This unit explains what work is, as well as the relationship between force and distance. It introduces the seven traditional simple machines and how they function. One or more simple machines may be combined to form complex machines capable of doing many repetitive, difficult, complicated, or dangerous tasks. Understanding how various machines work will help students to choose appropriate machines and use them properly.

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