Frequently Asked Questions
What is the impulse-momentum theorem?
J = F·Δt = Δp = m·Δv. Impulse equals the change in momentum. SI units: N·s (equivalent to kg·m/s).
Why does longer contact time reduce force?
Because impulse depends on m and Δv, not on Δt. Spreading the same impulse over more time means smaller average force - the principle behind airbags and crumple zones.
Can impulse be negative?
Yes - direction matters. A rebound reverses velocity, giving Δv with the opposite sign of the original velocity.
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