Momentum Calculator
Momentum, impulse and force.
Enter your values
ⓘ Live results
Results
- Momentum
- 18000 kg·m/s
- Change in momentum (impulse)
- -18000 N·s
- Average force
- -45000 N
- Kinetic energy
- 135000 J
- Deceleration
- -37.5 m/s²
Quick answer
Momentum is mass times velocity; changing it requires an impulse equal to force times time.
p = mv, J = Δp = FΔt
How to use the Momentum Calculator
- 1Enter mass in kilograms.
- 2Enter initial and final velocity in m/s.
- 3Enter the time over which the change happens.
Worked example
Using the values the calculator loads with:
Inputs
- Mass1200 kg
- Velocity15 m/s
- Final velocity0 m/s
- Collision time0.4 s
Results
- Momentum18000 kg·m/s
- Change in momentum (impulse)-18000 N·s
- Average force-45000 N
- Kinetic energy135000 J
- Deceleration-37.5 m/s²
Frequently asked questions
Is momentum conserved?
Yes, in any closed system with no external force.
Why do airbags help?
They extend collision time, cutting average force for the same momentum change.
About this calculator
- Built and reviewed by James Whitfield · How we build and test calculators
- Report an error
Results are estimates for general information. For medical, legal, structural or financial decisions, confirm with a qualified professional.