Momentum is possessed by a moving object and is what will keep moving. It is proportional to mass and velocity. A car travelling at a greater speed has more momentum than one travelling at a slower speed. However, it has less momentum than a heavy truck travelling at the same speed due to its larger mass. Momentum is calculated as the product of mass and velocity = mass x velocity

In an impact between two objects, each exerts the same force on the other. Force is equal to the rate of change in momentm. As momentum is a product of mass and velocity, the impacting objects will not rebound with equal speeds (unless the masses are identical and initial velocities equal and opposite). Injury is caused to bodies in a road traffic accident due to the rate of change in momentum: if this is reduced , such as by the use of crumple zones or air bags, it means that the force upon the body is less.

Momentum is conserved in an impact: the total momentum after the collision is the same total momentum before.

Collisions - a collision of 2 vehicles, the impact is elastic and the total momentum afterwards is the same as that before

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