Introduction to Impulse
In classical mechanics, the impulse of the combined external force on an object is equal to the increment of its momentum (ie the final momentum minus the initial momentum), which is called the momentum theorem. Unlike momentum, which is a state quantity, impulse is a process quantity. The impulse of a constant force refers to the product of this force and its acting time. Impulse expresses the physical quantity of the accumulation effect on the particle for a period of time, which is the reason for changing the mechanical motion state of the particle.