Master Professional Jack Groppel answers the question, “Can you tell my why the laws of momentum aren’t discussed more? All I ever hear about is acceleration, and I’m not convinced it is even a factor. I mean, if my racquet is traveling at 20 mph, it is going to exert a force on the tennis ball, and if the velocity of the racquet head is 40 mph, it will exert more force. Can you help me understand this?”