If you’ve ever watched a game of billiards, you may wonder why the players apply chalk to the end of their cue sticks. Or if you play, you might be curious about how and when it is recommended to ‘chalk up’. The reason chalk is applied to a cue stick is that it adds friction. Chalk adds ‘motion-resistance’ between the cue and the spot where it hits the cue ball. This prevents the cue from sliding off the ball prematurely, ruining the shot (called a ‘miscue’). Over time, the tip of a pool stick becomes worn and smooth from use. Chalk provides the friction necessary to make a shot. Another less-direct advantage to chalking up is that it forces the player to pace him or herself and spend a little extra time focusing and concentrating between shots.