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Where the word momentum is usually used?

For learning: English
Base language: English
Category: Language

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    The momentum of a given object in Physics has a precise meaning, and exactly the product:
    mass x velocity, (it is a vector, so it also ha a direction , the direction of the velocity)
    if this product has a high value, than the object would be hard to stop, unless with an object with a comparable momentum, but in the opposite direction.
    So the metaphorical meaning is as Alancoots said before.

    Usually this word is used when referring to something which is difficult to stop. For example, "Trains have a lot of momentum." Trains are large and heavy and often take a long time to slow down or stop.

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