如何计算Momentum

learn.whatIsHeading

Momentum is the product of mass and velocity, while impulse is the change in momentum caused by a force over time. Together they describe how objects change motion.

公式

The calculator finds momentum (p = m × v) and impulse (J = F × Δt = Δp)

J: F × Δt = Δp) — F × Δt = Δp)
F: Δp) — Δp)
p: m × v) and impulse (J = F × Δt = Δp) — m × v) and impulse (J = F × Δt = Δp)

分步指南

1Enter initial velocity, final velocity, mass, or force and time duration
2The calculator finds momentum (p = m × v) and impulse (J = F × Δt = Δp)
3Results show both values and verify the impulse-momentum relationship

例题解析

输入

m = 2 kg, v₀ = 5 m/s, v_f = 15 m/s

结果

Δp = 20 kg·m/s

Or F × t = 20 N·s for any force duration

常见错误注意事项

✕Confusing momentum direction with speed magnitude
✕Applying conservation incorrectly in systems with friction or air resistance

常见问题

Why is impulse important in collisions?

Extending the collision time (increasing Δt) reduces the force needed, which is why airbags save lives.

Is momentum conserved?

Yes, in isolated systems with no external forces. This is why collisions between objects follow predictable patterns.

准备好计算了吗？尝试免费的 Momentum 计算器

自己尝试一下 →