The adjective formed from "impulse" is "impulsive."
Patient
In an instinctive manner; by force of instinct; by natural impulse.
An impulsive force is a sudden and brief force acting on an object, resulting in a rapid change in its momentum. It typically occurs over a very short period of time, causing a quick acceleration or deceleration of the object.
change in momentum
He was a good fighter, but not very bright, and often impulsive.
The definition of impulse is change in momentum, how is there CHANGE in an instant? Or you are asking the instantaneous MOMENTUM, then it's the mass of the object times its speed. Or you are asking the CHANGE in momentum, impulse, after a specific time. If the average force applied to the mass is given, it's force times change in time. If a change in Force is observed, you have to integrate. If there is NO force applied, then the change in momentum is none.
Impulse refers to both force and time....... Impulse=(the change in Force)*(time) OR Impulse=the change in Momentum
On an impulse, I decided to answer this question.
Impulsive force
==doing something without thinking== an example would be talking out in class without thinking what you are going to say, it could be stupid so think before you act.To act impulsively means to act on a whim; suddenly; without forethought.
Impulse is the product of force and the time over which the force is applied. Therefore, impulse is directly related to force, as a larger force applied over a longer time will result in a greater impulse. Mathematically, impulse is equal to the force multiplied by the change in time.