Collision & Momentum Simulator
Smash discs together and discover the law that never breaks: total momentum is conserved in every collision, elastic or not.
This is real impulse-based 2D collision physics — no simplification. Pick a preset or drag on the table to launch a disc, then watch the system panel: total momentum stays constant through every disc-on-disc hit, while kinetic energy is only conserved when the collision is perfectly elastic (e = 1).
0 · Time: 0.0 s
Drag on empty space to launch a disc
Presets
System
Total momentum |p|conserved
0.00 kg·m/sp = (0.00, 0.00) kg·m/sTotal kinetic energyconserved (elastic)
0.00 Je = 1.00 · elasticSelected disc
Tap a disc to read its mass, speed, momentum and kinetic energy, and adjust its mass.
Formulas & sources
p = Σ mᵢvᵢ (conserved)
j = −(1+e)·vᵣₑₗ,n / (1/m₁+1/m₂)
v₁′ = ((m₁−m₂)u)⁄(m₁+m₂) (1D, e=1)
v₂′ = (2m₁u)⁄(m₁+m₂) (1D, e=1)