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Conservation of Momentum: Masses and Speeds

A simple calculator for passing on an impulse, e.g. in the event of a collision. A body with mass m1 collides with another, stationary body with mass m2 with velocity vb. The first body transfers part of its momentum to the second and then moves on with the velocity va, the other body now moves with the velocity v2. In reality, part of the energy is lost (deformation, sound), this is neglected here. The conservation of momentum is not violated by this loss, since the energy lost is also a momentum.

Mass object 1 m1:
Speed before, object 1 vb:
Speed after, object 1 va:
Mass object 2 m2:
Speed after object 2 v2:



Please enter four values, the fifth will be calculated. The units for mass and velocity are equal for both objects.

The momentum p is calculated as mass * speed. The formula for the above calculation is: m1 * vb = m1 * va + m2 * v2

Example: a white billiard ball with a weight of 180 grams hits another ball with a weight of 170 grams at a speed of 15 km/h. When the white ball completely releases its momentum, the other ball then has a speed of 15.9 km/h. If the cue ball is still moving at 5 km/h after the collision, the speed of the other ball is 10.6 km/h.


Physics commonly uses SI units. Here is a calculator to convert units.

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