Final answer:
A quarterback can use mass to increase tackling power as greater mass results in greater momentum for impactful tackles. Coaches advise keeping feet on the ground during tackles for better momentum transfer and stability.
Step-by-step explanation:
A quarterback in football could use mass to his advantage primarily by leveraging it to increase tackling power. This is because a higher mass at a given speed results in a greater momentum, thereby enabling the quarterback to make more impactful tackles. Contrary to option a), increasing mass does not inherently increase speed, and as for option b), decreasing mass may enhance agility but does not directly influence winning a game. Option c) is not accurate, as throwing accuracy is not predominantly a function of mass but of skill, technique, and environmental factors.
Football coaches often teach players to keep their feet on the ground while blocking, hitting, or tackling, to utilize the concepts of momentum, work, and energy more effectively. With their feet on the ground, players can apply force over a distance, thus doing 'work', and can increase their stability, allowing them to transfer momentum more efficiently to the opposing player. This is more effective than leaping actions which can result in a loss of control and decreased impact.
A small force can impart the same momentum as a large force if it acts over a longer period of time. Since momentum is the product of mass and velocity, by applying a small force for a sufficient duration, the velocity change imparted can be the same as that of a larger, more abrupt force. This principle is often exploited in sports to achieve strategic plays.