momentum conservation
Pronunciation
Noun
B2 Upper-intermediate
Quick answer
The physical principle that the total momentum of a closed system stays the same unless an outside force acts on it.
Usage notes
'Momentum conservation' and 'conservation of momentum' are used interchangeably, with the latter more common in textbooks.
Test yourself
Which word fits the gap? "_____ explains why a stationary ice skater drifts backward slightly after throwing a heavy ball forward."
Answer: momentum conservation
In your own words, what does "momentum conservation" mean?
The physical principle that the total momentum of a closed system stays the same unless an outside force acts on it.
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