When looking at the sport of bowling, one can easily say the velocity at which the ball is thrown and its mass are the factors in whether or not the pins fall down, but which one matters more, or do they have the same amount of importance? When looking at this question, momentum has to be focused on. The momentum of the ball as it is thrown is what causes the pins to fall down. As momentum is conserved as each pin hits another, the initial momentum of the ball is what matters most. But what is momentum? Momentum is defined by an objects mass multiplied by its velocity. Therefore, the balls mass and the velocity at which the ball is thrown have equal amounts of importance in knocking down the pins. Therefore it's best for a bowler to pick a ball that is heavy, but not so heavy that the bowler cannot throw it with a sufficient velocity.