A Billiard ball is a small, hard ball A ball is a round object with various uses. It is usually spherical but can be ovoid. It is used in ball games, where the play of the game follows the state of the ball as it is hit, kicked or thrown by players. Balls can also be used for simpler activities, such as catch, marbles and juggling. Balls made from hard-wearing metal are used in used in cue sports Cue sports , also known as billiard sports, are a wide variety of games of skill generally played with a cue stick which is used to strike billiard balls, moving them around a cloth-covered billiards table bounded by rubber cushions, such as carom billiards Carom billiards, sometimes called carambole billiards or simply carambole , is the overarching title of a family of billiards games generally played on cloth-covered, 5 by 10 feet (approximately 1.5 × 3 m) pocketless tables, which often feature heated slate beds. In its simplest form, the object of the game is to score points or "counts", pool Pool, also known as pocket billiards, is the general term for a family of cue sports played on a pool table with six receptacles called pockets along the rails, into which balls are deposited as the main goal of play, and snooker Snooker is a cue sport that is played on a large baize-covered table with pockets in each of the four corners and in the middle of each of the long side cushions. A regulation table is 12 ft × 6 ft (3.7 m × 1.8 m). It is played using a cue and snooker balls: one white cue ball, 15 red balls worth one point each, and six balls of different. The number, type, diameter, color, and pattern of the balls differ depending upon the specific game being played. Various specific ball properties such as hardness Hardness refers to various properties of matter in the solid phase that give it high resistance to various kinds of shape change when force is applied. Hard matter is contrasted with soft matter, friction coefficient Friction is not a fundamental force, as it is derived from electromagnetic force between charged particles, including electrons, protons, atoms, and molecules, and so cannot be calculated from first principles, but instead must be found empirically. When contacting surfaces move relative to each other, the friction between the two surfaces and resilience Resilience is the property of a material to absorb energy when it is deformed elastically and then, upon unloading to have this energy recovered. In other words, it is the maximum energy per unit volume that can be elastically stored. It is represented by the area under the curve in the elastic region in the Stress-Strain diagram are very important to the finer points of gameplay.[clarification needed]
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