What are the forces behind ballistics? Why do rocks and rockets soar through the air in an arch? The game is on the line. Suddenly, you hear the crack of a bat and the roar of crowd. Where will the ball land? How far will it travel? Is it a home run? You might think that hitting a home run or nailing a three-pointer is just luck, but there are many forces at work that determine if you've made a game-winning shot or...