Momentum Calculator

Use p = mv to calculate momentum in kg·m/s and related units from common mass and speed inputs.

Mass

Velocity

—kg·m/s

—N·s equivalent

—lb·ft/s

—direction sign

—p = mv

These are idealized classical-physics calculations. Real systems can differ because of air resistance, friction, deformation, measurement uncertainty, non-constant forces, or other effects not included in the selected model.

Physics model preflight

Check the governing model before trusting the number

classical linear momentum

p = mv

Reading the current native inputs…

Mass is non-negative; signed velocity preserves 1D momentum direction. This is an idealized educational model: unit consistency and valid inputs do not guarantee that omitted effects are negligible in a real system.

Momentum reverse solver & energy cross-check

Solve momentum, mass or velocity from p = mv, then calculate the corresponding classical kinetic energy for the solved mass/velocity pair.

Solve forMass (kg)Velocity (m/s)Momentum (kg·m/s)

—Solved quantity

—Kinetic energy

Ready.

State the model before trusting the number

Classical formulas are only as good as their assumptions and units. Air resistance, damping, deformation, non-constant forces and measurement uncertainty are not silently invented when the selected model does not include them.

Governing physics model

p = mv — classical linear momentum.

How to verify the result

Divide momentum by mass to recover signed velocity. Reversing velocity should reverse momentum without changing its magnitude.

Domain and assumption boundary

Mass is non-negative; signed velocity preserves 1D momentum direction. The calculator does not silently add drag, damping, deformation, varying fields, relativistic effects, measurement uncertainty, or geometry that the selected model does not contain.