Linear momentum is a fundamental concept in physics that applies to objects regardless of whether they have uniform or variable velocity. The principle of linear momentum, also known as the law of conservation of momentum, states that the total momentum of a system remains constant if no external forces act on it.
Mathematically, linear momentum (p) is defined as the product of an object's mass (m) and its velocity (v):
p = m * v
This definition holds true regardless of whether the velocity is constant or changing. If an object's velocity changes, its momentum will change accordingly, reflecting the object's varying motion. For example, if an object accelerates, its momentum will increase, and if it decelerates, its momentum will decrease.
The conservation of momentum is particularly useful in analyzing collisions and interactions between objects. In such cases, the initial momentum of the system is compared to the final momentum to determine the resulting motion and velocities of the objects involved.
In summary, linear momentum is applicable to bodies with uniform as well as variable velocity. The concept remains valid as long as there are no external forces acting on the system under consideration.