Elastic-collision laboratory
Mission: predict the outgoing velocities when equal masses collide, then verify momentum and kinetic-energy conservation.
Live measurements
Green momentum6.00 kg·m/s
Gold momentum0.00 kg·m/s
Total momentum x6.00 kg·m/s
Total kinetic energy9.00 J
Green velocity3.00 m/s
Gold velocity0.00 m/s
Equations with live values
p = m × v
K = ½ × m × v²
m₁u₁ + m₂u₂ = m₁v₁ + m₂v₂
½m₁u₁² + ½m₂u₂² = ½m₁v₁² + ½m₂v₂²
Head-on result: v₁ = ((m₁ − m₂)u₁ + 2m₂u₂) ÷ (m₁ + m₂)
Head-on result: v₂ = (2m₁u₁ + (m₂ − m₁)u₂) ÷ (m₁ + m₂)
Elastic collision: relative approach speed = relative separation speed
Conservation graph
Momentum magnitudeKinetic energy
Camera and focus
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Tap either ball, a velocity arrow, the contact point, or the centre-of-mass marker for a short explanation and close-up. Drag empty space to pan.
Interactive visual lecture
A five-second prediction hook comes first. Each narrated quantity appears as a vector, equation, collision animation, conservation trace, or focused close-up.
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What to watch: velocities, contact impulse, and conserved totals.
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