Momentum Calculator
Momentum, impulse and force.
Enter your values
Enter the mass in kg.
Enter the velocity in m/s.
Enter the final velocity in m/s.
Enter the collision time in s.
Results update instantly as you type — no submit needed. Your values are remembered on this device, and the shareable link reopens the calculator with exactly these numbers.
- 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
At a glance
| What it does | Momentum, impulse and force. |
|---|---|
| Category | Science |
| Inputs needed | Mass, Velocity, Final velocity, Collision time |
| Main output | Momentum |
| Formula | p = mv, J = Δp = FΔt |
| Cost | Free — no sign-up, no download |
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.
Inputs explained
- Mass(kg)
- Enter the mass in kg.
- Velocity(m/s)
- Enter the velocity in m/s.
- Final velocity(m/s)
- Enter the final velocity in m/s.
- Collision time(s)
- Enter the collision time in s.
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.
What do I need to enter into the Momentum Calculator?
Just 4 values: mass, velocity, final velocity, collision time. Every field starts with a realistic example, so you can change one number at a time and watch the result update instantly.
How does the Momentum Calculator work out the answer?
Momentum is mass times velocity; changing it requires an impulse equal to force times time. It applies the formula p = mv, J = Δp = FΔt and shows the working so you can check each step by hand.
Is the Momentum Calculator free, and do I need an account?
It is completely free with no sign-up, no download and no usage limit. Everything is calculated in your browser, so the numbers you type never leave your device.
Results are estimates for general information. For medical, legal, structural or financial decisions, confirm with a qualified professional.