We call the magnitude that measures the capacity that a body has to produce an effect on other bodies in a collision linear momentum.

We call the variation of linear momentum impulse. When we increase the linear momentum of a body, it is receiving a positive impulse; when we diminish its linear momentum, the impulse is negative. 

	The value of linear momentum is the product: p=m·v
	Impulse I=F·t can increase linear momentum.
	It is also possible for impulse I=F·t to decrease linear momentum if it is oriented the opposite way.

Principle of conservation of linear momentum: When a particle system does not receive an external impulse, its total linear momentum remains constant.