Link between technology and physics



#credit:Atta Ur Rehman sir 
#physics is fun.

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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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Important points for Entrance

Liquid pressure is always perpendicular to surface area under consideration. •               Pressure acts equally in all possible directions. •               Liquid pressure depends on depth (h) of point below free surface, density  of liquid and acceleration due to gravity (g) at the place. •               Liquid pressure is independent of amount of liquid, shape of vessel and area of consideration. So a given liquid is filled in vessels of different shapes to same heights then pressure at the base of each vessels will be same. •               Pressure will be same at all points in a liquid lying at the same level. Therefore the height of liquid level at rest is equal in all vessels of different shapes and sizes when the...
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