One of the universal theorems of momentum theorem dynamics. The content is the increment of the momentum of the object equal to the impulse of the external force it receives, ie Ft = Δvm, or the vector sum of the impulses of all external forces. If a system is free of external forces or the vector sum of external forces is zero, then the total momentum of the system remains the same. This conclusion is called the law of conservation of momentum. The law of conservation of momentum is one of the most important and most universal conservation laws in nature. It is applicable to both macroscopic and microscopic particles. It is suitable for both low-speed moving objects and high-speed moving objects. It is an experimental law. It can be derived from Newton's second law and kinetic energy theorem. Momentum: ΔM=F*ΔT
F = force
ΔT = time change
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