What happens to momentum when a football players combine in a tackle?

Answer 1

The simple answer is run faster and don't slow down at the moment of tackling.

The other answer is tackle low: it doesn't change the momentum, but it increases the effect of the tackle.

Answer 2

The player looses momentum,which is movement (speed). The collision causes contact between the two players which then causes the players to slow down. After a collision, however, a player can build momentum back up. After undertaking a collision, the player will slow down.