One mobile game has taken over IHS: Clash Royale. Most people either play it because the like it, or just simply have it on their phone because one of their friends made them download it. Regardless, one of the most controversial aspects of the game is filled with physics that is taken for granted. The X-Bow is a crossbow that fires huge arrows at outrageous speeds. The mystery behind a crossbow is how such a simple mechanism can create such speed and force behind an arrow. The answer is simple: Potential Energy. When the string of the crossbow is pulled and locked back tightly, work was done on the string giving it stored potential energy. This potential energy will be converted into Kinetic energy in the arrow when released, sending it flying. This explains why the arrow flies faster the tighter the bowstring is, or if you pull it back farther. A higher potential energy inevitably means a higher kinetic energy.