impulse
Pronunciation
Noun
B2 Upper-intermediate
Quick answer
The change in an object's momentum caused by a force acting on it over time, or a sudden urge to act without thinking.
Usage notes
In everyday English "impulse" usually means a sudden urge, while in physics it has a precise, measurable meaning.
Test yourself
Which word fits the gap? "In physics, an _____ equals the force applied multiplied by the time it acts for."
Answer: impulse
In your own words, what does "impulse" mean?
The change in an object's momentum caused by a force acting on it over time, or a sudden urge to act without thinking.
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