There are many forces that make the world work. Gravity keeps our feet firmly on the ground while friction helps us move. The forces of air and water resistance influence how airplanes and boats both move. These invisible forces can be difficult for young learners to follow. But through this beginner's guide, readers will get the basics of forces! With the help or Snappy the Nile crocodile, readers will learn about each force and be asked questions that encourage them to discover more.