Impulse
Measurement system
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In classical mechanics, impulse is the change in momentum of an object. If the initial momentum of an object is p₁, and a subsequent momentum is p₂, the object has received an impulse J:
Momentum is a vector quantity, so impulse is also a vector... Wikipedia
Physics symbol: J
Other units: kg⋅m/s in SI base units, lbf⋅s