What is the best trick to solve the questions involving kinematics and newton laws?
Answers
Answer:
Read thr question and try to draw diagram if possible
Answer:
Many students find mechanics to be a nightmare. It’s simply because they do not follow the right approach and try to mug up. They do not develop the understanding needed to attempt the problems. The result? It’s frustration and lack of confidence.
Firstly, get this fact right: JEE gives considerable weightage to Mechanics (about 25-30%) every year. This means one must pay a lot of attention to it. And, if you learn it well, you will enjoy Physics much more.
Some simple, effective tips and tricks can turn mechanics into one of your strong areas. Interested in knowing how this can be done? Read on!
Build a Solid Math Foundation
Physics for the JEE uses basic Calculus. Before you do anything with mechanics, you must get a basic idea of vectors and graphs. Also, it’s crucial learn to differentiate and integrate. Do you get sleepless nights thinking about mathematics? Here’s a useful article about it. How to Get Rid of the Maths Phobia
Finish Studying Chapters till Rotation. Then Identify your Strengths
First, complete the chapters till rotation. Do not hurry. Take your time. Also, do NOT attempt JEE papers yet. Solve easy and medium level questions.
To simplify learning, break Mechanics into these two modules:
The part where you get to know all your basic concepts. This includes:
Kinematics – Introduces definitions and key terms
Newton’s Laws – Introduces force equations
Work and Energy – Introduces Law of Conservation of Energy ( work-energy theorem )
Momentum – Law of conservation of momentum
Rotation – Torque equation and Law of conservation of angular momentum.
The part where you apply them. It includes chapters:
Gravitation
SHM
Fluid Mechanics
Elasticity
Concentrate on Understanding Concepts and their Applications
Identify and convert keywords into their meaning in physics
Let’s look at a few keywords and their meaning in physics.
Do you what ‘maximum height’ means? It means velocity in the vertical direction is zero.
What about ‘just begins to slide’? Static friction has reached its maximum value.
A ball is dropped? It means its initial velocity is zero, relative to the dropper.
So, the idea is to make a list of such words and their meanings in a separate notebook/paper and keep revising it.
Definitions of terms
How about answering this, folks?
Acceleration is always in the direction of velocity. True or False? Answer in your mind. Now read on!
Did you say false? Then you are correct. Acceleration = rate of change of velocity. So, it is in the direction of change of velocity, which may or may not be the same as the direction of velocity.
Bottom-line? Understand the definitions properly. Only then you can say that the ground work is done and you are ready for the real deal!
It would also be helpful to work on Conservations Laws (Energy, Momentum, and Angular Momentum) & Force and Torque Equations to get better clarity.
Solving Mixed Type Problems
JEE often tends to mix problems from 3-4 chapters in mechanics. With all the tools you have, you can solve them by the following a step-by-step approach. Thinking about Conservation – Equation – Definition (in the exact order) should be your mantra.
Read the problem first and start asking questions to yourself.
Always think about conservation laws first. Can you use conservation of energy or momentum in the question? Examples of such situations may be the spring-mass system, projectile splitting into two parts, a bullet fired from a gun, etc.
If there’s a rotating body, can you possibly use conservation of angular momentum for that particular problem?
If the problem remains unsolved, then use force/torque equations. Pulley problems, ladder based questions, etc. are best solved by this method.
On a Kinematics problem, ask yourself if it involves relative velocity? Use the definitions here.
The Rest of the Chapters
After sufficient practice, you can now move on and finish up the remaining sections of mechanics. These chapters should now feel easy.
Explanation:
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