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I'm having trouble understanding what the relation is between the impulse of a force during a collision and the changes in linear and angular momentum during the collision.

I know that the principle of conservation of linear momentum says that the total linear momentum before is equal to the total linear momentum after and the principle of conservation of angular momentum states that the total angular momentum before is equal to the total angular momentum after, but am struggling with the interpretation of this.

Do these principles mean that

1) the sum of the impulse + linear momentum before + angular momentum before = linear momentum before + angular momentum after

OR

2) (the sum of impulse + linear momentum before = linear momentum after) AND ALSO (the sum of impulse + angular momentum before = angular momentum after)?

With very many thanks,

Froskoy.