Provide students with an opportunity to closely examine the difference between a topic and main idea in a nonfiction text. Use as a stand-alone activity or a support for the Finding the Main Idea and Details in a Nonfiction Text lesson.

What do a bicycle and a car have in common? They both move using the simple machine wheel and axle. In this lesson, students learn about how this simple machine works, and will identify objects that use a wheel and axle.