Now it is clear that the quan6ty mv must be an

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Unformatted text preview: . Equa6on (1) tells us that the vector sum of mv of the two par6cle is constant in 6me, if no external force is ac6ng on the system. Now, it is clear that the quan6ty mv must be an important physical quan6ty. And, it is. It is called the linear momentum of the body. It is a vector quan6ty and its SI unit is kgm/s. It is usually denoted by p: p = mv Conserva6on of linear momentum For a system of two par6cles with momenta p1 = m1v1 and p2 = m2v2, we have just shown that d ( p1 + p2 ) = 0 dt if no net external forces act on the system. Thus, for such a system, we have ptotal = p1 + p2 = const . This can be generalized to any number of par6cles. We can therefore state: Whenever two or more par6cles in an isolated system interact, the total momentum of the system remains constant. This is known as the principle of conserva1on of lin...
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