Every time you throw a baseball, race up the stairs, or push a friend on a swing, you are using invisible energy to get things going. If you have ever wondered what makes a toy car speed across the floor or a heavy rock tumble down a hill, the answer is all about force. This fun and engaging science book guides you through the basics of physics using everyday activities you already love. You will explore how pushing and pulling changes the way objects behave, complete with fantastic cartoon illustrations that make learning a breeze. It even includes a cool experiment you can try at home to understand friction. You will have a great time discovering the amazing rules of motion that shape everything in your world!