Law of Conservation of linear momentum

 

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Something you must know before starting studying Physics

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 In the development of physics it turned out again and again how difficult, but also important it was to develop the most suitable concepts and find the relevant quantities (e.g. force or energy) in terms of which nature can be described both simply and comprehensively.Every physical quantity consists of a a measured value and a measuring unit, i.e. a pure number and a dimension. All difficulties in conversations are avoided, if we treat both parts like a product “value times dimension”. Insert: Denotations: It is an accepted thing in international physics for long time past to abbreviate as many of the physical quantities as possible by the first letter of the corresponding English word, e.g. s(space), t(time), m(mass), v(velocity), a(acceleration), F(force), E(energy), p(pressure), R(resistance), C(capacity), V(voltage), T(temperature), etc.. Of course there are some exceptions from this rule: e.g. momentum p, angular momentum l, electric current I or potential V.     ...
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CONSERVATION LAWS

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 In any physical phenomenon governed by several different forces, several quantities may change with time.However, some physical quantities remains constant in time.These quantities are the 'conserve quantities' of nature.This remarkable fact is the basis of many law called conservation laws. There are nearly 14 conservation laws based on symmetry principle on Physics.And from those 14 laws discussion of some of the laws are given below:   Law of conservation of linear momentum  If no external force acts on system of colliding objects, then the total momentum of the objects, in a given  direction before collision is equal to the total momentum of object in same direction after collision.      2. Law of conservation of mass energy when a body falls freely in vacuum under the effect of Earth's Gravity, the total mechanical energy (sum of kinetic and potential energy) remains constant. Both the kinetic and its potential energy change continuousl...
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