Mechanics
Impulse
Impulse equals change in momentum.
Variables
JN·s
Impulse
Change in momentum
FN
Average force
Force during collision
Δts
Time interval
Duration of force
Δpkg·m/s
Change in momentum
Final - initial momentum
Derivation
From F = dp/dt, integrate: J = ∫F dt = Δp.
Your notes
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Common questions
What is the Impulse formula?
Impulse is written J = FΔt = Δp. Impulse equals change in momentum. It belongs to Mechanics, under Momentum.
What are the units in J = FΔt = Δp?
In SI units, J is impulse, measured in kg·m/s; F is average force, measured in kg·m/s²; Δt is time interval, measured in s; Δp is change in momentum, measured in kg·m/s.
How is the Impulse formula derived?
From F = dp/dt, integrate: J = ∫F dt = Δp. The result is J = FΔt = Δp.