Laws Of Physics

By nature, laws of physics are stated facts which have been deduced and derived based on empirical observations. Simply put, the world around us works in a certain way, and physical laws are a way of classifying that “working.”

Physical laws are just conclusions drawn based on years (or however long it takes) of scientific observations and experiments which are repeated over and over under different conditions to reach inferences which can be accepted worldwide. These are continuously validated by the scientific community over time.

Important Laws of Physics:

Application of Laws Of Physics

In the beginning, it was assumed that the earth was the centre of the universe. Then it was hypothesized that our sun is the centre of the universe. We now know that both these conclusions are wrong. The sun may be the centre of our solar system, but it is not the centre of the universe.

Another example is the odd behaviour of the planet Mercury. Newton’s universal law of gravitation was able to explain all the other planets in the solar system but the orbit and rotational period of Mercury was a bit off, and for some time no one knew why. Einstein came to the rescue with his general theory of relativity later on.

The different properties of laws of physics which shed information about their nature is given below:

  • True, under specified conditions
  • Universal and do not deviate anywhere in the universe
  • Simple in terms of representation
  • Absolute and unaffected by external factors
  • Stable and appear to be unchanging
  • Omnipresent and everything in the universe is compliant (in terms of observations)
  • Conservative in terms of quantity
  • Homogeneous in terms of space and time
  • Theoretically reversible in time

Basic laws of physics that govern our universe can be categorized in two ways. Classical physics that deals with us, the surrounding environment and the observable universe around us. Apart from this, there is also atomic physics that deals with subatomic particles and their interactions (quantum mechanics).

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Practise This Question

A uniform heavy chain of length 'a' initially has length 'b' hanging off of a table. The remaining part of chain a - b, is coiled on the table. If the chain is released, the velocity of the chain when the last link leaves the table is