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How to Solve Numericals in Physics?

Shuddhodan Sapre
22/04/2021 0 0

Are you scared of numerical? Do you think you don't understand them? If yes, then read ahead.

See, it might be any exam, but numerical won't leave your back.

So let's talk about common problems and their solutions:

Problem 1: Sir, I am not able to understand what the numerical is saying!

Solution: It's simple, read again, find the meaning of the word and see again and again for words you don't understand. It's a problem of vocabulary or non-understanding of concepts.

Let me give you an example:

Force is mass multiplied by acceleration. So if I want to ask you to find the force and frame it like "Find force when mass is 5kg, and acceleration is 8 m/s²", I don't think anybody would have a problem. Now the same question when I frame it like " Find the rate at which momentum changes for a 5kg body moving with a constant rate of 8 m/s²" is the same question why did you feel it to be difficult? Firstly, because you might not know that the rate of momentum is a force as per Newtons 2nd law, nowhere does it mention mass or acceleration, and you might not know its units. So we can't get hold of a numerical either if we don't understand the words that the paper setter is using or simply are not aware of the concept.

I'll tell you a fun fact. Many times teachers interpret questions differently. So it is okay, and eventually, you will get the hang of it.

Problem 2: I make a lot of silly mistakes.

Solution: Practice! Practice! Practice! And work on your focus because we have Netflix, amazon prime, IPL, Anime and many more things in our life to distract us. BTW I have learned how to balance, so if I can, you can too! Find your distractions work on them learn to focus.

Know what everyone does is eventually stop doing numerical, and they avoid practice which is quitting. Don't do that. Tell yourself you can do it, and humans make errors. Be happy the next time you make a mistake and make sure you work on it and never repeat it.

How to approach numerical?

1) Find the concept hidden like in the above example; the concept is of force.

2) Identify the formula or formulas related to the concept. (While practising, it is okay if you look at the formulas rather than memorizing). In the example, the formula is F =M x A.

3) Try to fit the given data in the formula and see how you can get the asked data. So in the above example, since M and A are given, it's a matter of just putting the values. But what if instead of A, they give you U, V and S. As I can see, these are variables from the kinematic equations, and if A is constant, I can use them and find A and hence F.

4) Remember Units. I can't emphasize enough on this enough. Sometimes units will give you a helping hand.


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