Bowling ball random when impacting a full rack of pins on the first delivery of a frame, and sometimes when hitting downed "dead wood" pins on subsequent deliveries—the candlepin bowling sport is the only major one that allows fallen pins, provided no part of any fallen pin extends more than 24 inches (61 cm) forward of the head-pin spot, to remain on the lane's pindeck to be used in knocking down more pins with the next ball delivery in the same round—up to three balls are delivered, much as in duckpins, in each round of candlepins for one bowler. Bowling ball A
Ten-pin bowling to knock down all ten bowling pins. Optimal ball speed, which is defined as the time it takes for the ball to travel from one foot past the foul line to the head pin, is 2.3 seconds (this number can shift to 2.2 or 2.4 depending on the dryness or slickness of the lane). A ball that is rolled too fast will not give the pins enough time to “mix” with other pins, or in other words, to knock each other down in a domino effect motion. Conversely, a ball rolled too slowly will deflect too much and will not