A ball drops to the ground. Leaves fall from a tree. Gravity is at work all around you. But what exactly is gravity? And how does it affect different objects? Read this book to find out! Learn all about matter, energy, and forces in the Exploring Physical Science seriesâpart of the Lightning Bolt Booksâą collection. With high-energy designs, exciting photos, and fun text, Lightning Bolt Booksâą bring nonfiction topics to life!