What is Law of Conservation of Energy in Physics
Law of Conservation of Energy
Law of Conservation of Energy
Statement:
The law of conservation of energy states that “Energy may neither be created nor destroyed, it can only change shape”
Explanation:
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
Therefore,
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.
I note right away that the classification and characteristics described below are rather arbitrary. The advantages of one could be attributed to the disadvantages of the other and vice versa. And by and large, there are a lot of reservations that I did not mention, because and so the chapter probably turned out to be quite long and even somewhat boring.
