3.7.The basic equation of the dynamics of the translational motion of a material point. Material point impulse

Newton's second law can be written in another form. According to the definition:

,

then

or

Vector called the momentum or the amount of body motion and coincides in direction with the velocity vector , but expresses the change in the momentum vector.

Let's convert the last expression to the following form:

(3.6)

Vector called impulse force .

This equation is an expression of the basic law of the dynamics of a material point: the change in the impulse of a body is equal to the impulse of the force acting on it.