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## Main Question or Discussion Point

I have a fundamental question regarding conservation of momentum (not homework).

So if we have a system of 2 balls, identical in size and weight, one of which is initially stationary until hit by the other ball. We have the following:

m1v1 + 0 = 0 + m2v2

or v2 = v1

and therefore there is conservation of momentum. Now what happens when say a biker hits the pavement with his helmet... how does momentum conserve? Is this a system of earth vs bikers head? How can I quantify the conservation of momentum? having a hard time understanding...

So if we have a system of 2 balls, identical in size and weight, one of which is initially stationary until hit by the other ball. We have the following:

m1v1 + 0 = 0 + m2v2

or v2 = v1

and therefore there is conservation of momentum. Now what happens when say a biker hits the pavement with his helmet... how does momentum conserve? Is this a system of earth vs bikers head? How can I quantify the conservation of momentum? having a hard time understanding...