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In the game of billiards, a white ball, known as the cue ball, is struck by the cue so that it hits other balls, the objective being to knock other balls into holes that are located at the corners of the table, as well as 2 along each length. Thinking about the transfer of energy starting from the cue, we can ask ourselves the question, how does for example, an 8-ball end up going to the pocket, especially since we cannot directly touch this ball? The answer lies in the fact that when anything that is moving comes into contact with something still, there is a transfer in energy, or more specifically, a transfer in momentum. Momentum is, crudely put, the "amount" of motion of a moving object, which can be calculated by multiplying the mass and velocity of the object. The transfer of momentum is from the cue, to the cue ball, which finally transfers energy to the target ball, such that it may go in the pocket.