Momentum calculator
Fill in what you know and leave the unknown box empty — it works out whichever one is missing. Nothing is uploaded; the arithmetic happens in your browser.
The formula
p = mv
Where this usually goes wrong
Momentum has direction. In a collision question, one object moving the other way takes a minus sign.
Worked example
A 1500 kg car at 20 m/s carries 30,000 kg·m/s.
Those numbers are already in the boxes above — press Work it out to see it, then change them for your own.
Related physics calculators
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