mechanics
Momentum Calculator
Solve and audit one-dimensional two-body collisions: elastic, perfectly inelastic, custom restitution, or measured final velocities.
Calculator
Formula
Σp_before = Σp_after; e = (v₂-v₁)/(u₁-u₂)
- p — Momentum
- kg·m/s
- m — Mass
- kg · g · mg
- v — Velocity
- m/s · km/h
Assumptions and limits
- Uses a signed one-dimensional velocity axis and positive masses; closed collision solutions conserve linear momentum.
Example
A 5 kg object moving at 4 m/s
The calculator starts with an editable example.
Sources
- University Physics Volume 1 — OpenStax
Frequently asked questions
Are my inputs uploaded?
No. This calculator runs locally in your browser. Inputs are placed in a URL only when you explicitly copy a share link.
Why are units converted first?
Canonical units prevent scale errors when inputs use mixed units. The result is converted back to your selected output unit afterward.
Does the result replace professional judgment?
No. The result applies only to the stated model and assumptions. Qualified people should review high-risk engineering, medical, or laboratory decisions.