This book is a popular science book about physics suitable for the serious reading of secondary school students in all grades. The book starts with “simple linear motion” in daily life, guiding you to scientifically evaluate the classic problem of the tortoise and the hare race. It then uses “ubiquitous forces” to help you understand a real-world filled with interactions. As you journey through the book, you’ll comprehend the essence of “sitting on the Earth and traveling eighty thousand li a day” and decipher the aerodynamics behind a football player’s “sensational screw shot.” You will gain meaningful insights into the numerous scientific questions you are concerned about through reading this book.