When blocking in football, why does a defending lineman often attempt to get his body under that of his opponent and push upward? What effect does this have on the friction force between the opposing lineman's feet and the ground?
it reduces the friction which makes the lineman unstable.
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This makes it easier for the defending lineman to move the opposing lineman out of the way. The reduced friction force between the feet and the ground also makes it easier for the defending lineman to maintain his balance and stay in position.
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