Wheels: Bring a childs size bike to class. Turn it upside down and use it to demonstrate how the pedals make the Wheels go around. Let your preschoolers take turns pedaling the bike with their hands, inspecting the gears, testing the breaks, etc. Think up and talk about different wheel types. Car Wheels, Bike Wheels, Spin Wheels, Ferris Wheels, Wagon Wheels, Steering Wheels, etc.

Read the Book "What do Wheels do all day?" by April Jones Prince