What is Law of Conservation of Energy in Physics

Law of Conservation of Energy


Law of Conservation of Energy




The law of conservation of energy states that “Energy may neither be created nor destroyed, it can only change shape”



Consider a body of mass “m” at height “h” above the ground. Its kinetic energy


at that point A is:


K.E = 1/2(mv2)


K.E = 1/2 m * (o)


K.E = o…………..(i)


The potential Energy at point A is:


P.E = mgh …………(ii)


So the total energy at point A will be:


T.E = K.E + P.E


E(A) = O + mgh


E(A) = mgh



Suppose the body is released from this height and falls through a distance x. Its new height will be (h-x]. The velocity with which it reaches point B is calculated by using the third equation of motion:


2gs = Vf2 – Vi2


As we know:


Vi = 0

S = x



2gx = Vf2 – 0

2gx = v2


The kinetic energy at point B is:


K.E. = 1/2 mv2


Substituting the value of v2:


K.E.= 1/2*m * 2gx


K.E = mgx


The Potential Energy at point B is:


P.E = mgh


The height of the body is (h-x):


P.E. = mg(h-x)


The total energy at point B is: y


E(B) = PE + K.E.


E(B) = max + mg(h-x)

E(B) = mgx + mgh -mgx


E(B) = mgh


Hence, the total energy at point A and B are some. It means that the total value of energy remains constant.


Note: As a result, “there was nothing to sing songs about with a guitar” and with some of the acquaintances, the connection was practically interrupted. You can blame me for snobbery and arrogance (and unwillingness to be friends with porters, too), but it does not change the essence. For me there is nothing worse than wasting time on idle chatter about anything. The question of the low culture of our generation is one of the most acute for discussion in the working kitchen. In trying to defend our point of view, we reach practically to the massacre (very culturally, I know). All agreed that a good education is a collective concept. For this, it is not necessary to graduate from State University and sit for whole days behind books, looking sadly at how the best years of your life escape. A lot of curiosity and desires, Desire to draw information and form on everything that surrounds us. Try on different situations and hypothetically solve them. Be interested and be interesting.

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