1. Product of the weight m and velocity v for a mass point:
The impulse/pulse is vectorial variable; its direction is same as the velocity involved. The time differential quotient for the impulse/pulse associated with a mass point is equal to the force F applied to it.
2. When investigating control circuit elements, idealised rectangular functions and the like are applied at the input and response functions from the transfer element are incorporated. A rectangular signal which only lasts for a very short time, compared with the timescale of interest, and has a very large amplitude is referred to as a pulse or shock function. These kinds of test signals were thoroughly investigated by P. A. M. Dirac. They are also referred to therefore as a Dirac pulse or Delta function or even a unit pulse.