Frequently Asked Questions
What is the momentum formula?
Linear momentum p = m × v. SI units are kilogram-meters per second (kg·m/s).
Is momentum conserved?
Yes - in any closed system, total momentum before equals total after a collision or interaction.
How does this differ from kinetic energy?
Momentum scales linearly with velocity; kinetic energy scales with v². Doubling speed doubles momentum but quadruples KE.
How do I convert km/h to m/s?
Divide by 3.6, since 1 m/s = 3.6 km/h. For example, 72 km/h ÷ 3.6 = 20 m/s. Always convert to m/s before using p = m × v, or the momentum comes out 3.6 times too large.
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