Calculate the momentum from mass and velocity, with different units. The momentum tells, with which vehemence an object moves. If this object hits another one, a part of the momentum is passed, a part is kept. The total size of the momentum doesn't change (conservation of momentum). The unit for the momentum is newton-second Ns, this is calculated as kilograms times meters per second, Ns=kg*m/s.
Example: a bicyclist, who together with his bicycle has a mass of 90 kilograms and is speeding downhill with 50 kilometers an hour, has a momentum of 1,25 kilonewton-seconds (kNs).
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