Forces and fields are a great deal in Physics. In this book, we present the ideas of forces and fields in a simple-to-understand and interactive manner. Our intention is that students grasp the concept of forces in Physics and that they understand why fields are used to express forces in nature. Only gravitational forces/fields are extensively treated in this book, other forces/fields are treated extensively in other books in this series. For a more beautiful understanding, we have used a good number of relevant numerical examples/exercises to present the ideas.