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Because the heavier football player has a much higher momentum which is product of mass and velocity. To cancel the momentum of a heavier football player one must achieve the same momentum at impact. A lighter player can only do that by increasing his velocity.

Momentum = mass x velocity

If a football player weighed 100 Kg and was traveling at 5 m/s (11 miles per hour). A 50 Kg person would have to impact the heavier football player at a speed of 10 m/s (22 miles per hour) to cancel the inertia of the heavier football player.

As the heavier football player goes faster it becomes increasingly difficult to stop them. You can also take several lighter players by combining their mass to stop the forward momentum of the heavier football player.

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Q: Why Is it harder to stop a heavy football player rushing the ball than it is to stop a lighter one?
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Why is it harder to stop a heavy football player than a lighter football player?

A heavy football player is harder to stop because it has a greater momentum. In physics, momentum is equal to the mass of an object times its velocity. If a 50 kilogram kid and a 70 kilogram man were running at the same speed, the man would be harder to stop because he would have a greater momentum.

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