Master IIT JEE Mechanics With The D-W-M-Y Formula


JEE Main 2022 Session 1 and Session 2 just completed. Students are now eagerly waiting for JEE Advanced 2022. Those who are preparing for JEE Main 2023 must buckle up their shoes and get ready for the challenge. Out of the enormous syllabus of JEE Main, Mechanics hold a large sum (around 23% weightage across JEE Main and Advanced). It includes some interesting topics like motion, vectors, laws of friction, work-energy theorem, laws of motion, gravitation, etc. Today, we are going to share some great tips on how to revise Mechanics for JEE without forgetting any concepts! 


First, let us go through the Mechanics syllabus for JEE 2022-2023. 


Mechanics JEE Syllabus 2022-2023


Mechanics JEE Syllabus 2022-2023

Physics and Measurement (Weightage 5.33%)

Physics, technology and society, S I Units, fundamental and derived units, least count

Accuracy and precision of measuring instruments, Errors in measurement

Dimensions of Physics quantities, dimensional analysis and its applications


Kinematics (Weightage 1.67%)

The frame of reference, motion in a straight line, Position- time graph, speed and velocity; Uniform and non-uniform motion, average speed and instantaneous velocity, uniformly accelerated motion, velocity-time, position-time graph, relations for uniformly accelerated motion

Scalars and Vectors, Vectors - Addition and subtraction, zero vector, scalar and vector products, Unit Vector, Resolution of a Vector

Relative Velocity, Motion in a plane

Projectile Motion

Uniform Circular Motion


Laws of Motion (Weightage 2.67%)

Force and inertia, Newton’s First law of motion, Momentum, Newton’s Second Law of motion, Impulses; Newton’s Third Law of motion

Law of conservation of linear momentum and its applications

Equilibrium of concurrent forces

Static and Kinetic friction, laws of friction, rolling friction

Dynamics of uniform circular motion, centripetal force and its applications


Work, Energy and Power (Weightage 3.67%)

Work done by a content force and a variable force

Kinetic and potential energies

Work-energy theorem


The potential energy of spring

Conservation of mechanical energy, conservative and neoconservative forces

Elastic and inelastic collisions in one and two dimensions


Rotational Motion (Weightage 6.33%)

Centre of the mass of a two-particle system, Centre of the mass of a rigid body

Basic concepts of rotational motion; a moment of a force; torque, angular momentum, conservation of angular momentum and its applications; the moment of inertia, the radius of gyration

Values of moments of inertia for simple geometrical objects, parallel and perpendicular axes theorems and their applications

Rigid body rotation equations of rotational motion


Gravitation (Weightage 3.33%)

The universal law of gravitation

Acceleration due to gravity and its variation with altitude and depth

Kepler’s law of planetary motion

Gravitational potential energy; gravitational potential

Escape velocity, Orbital velocity of a satellite

Geostationary satellites


How to Prepare Mechanics for JEE? 


As you can see the mechanics syllabus includes many different topics. So, if you are starting your preparations for JEE 2023 now, it is the perfect time to start with mechanics. Firstly, because mechanics is quite tough and the earlier you handle tough concepts the better. Secondly, you can easily apply the trick that we are going to share with you - the D-W-M-Y formula! 


What is the D-W-M-Y formula? 


This is a simple yet effective strategy that you can apply in mechanics or any other topic of the JEE syllabus that seems tough to you. Before we share the details of the formula, here are some things that you must know: 


#1 You cannot expect yourself to remember every concept that you are studying today even after a month. The human mind tends to forget something that they have not studied for a long time. So, revision is necessary to brush up on all the concepts. 


#2 You cannot complete the whole syllabus in one day. You need to divide your JEE syllabus of Mechanics or any other topic into small chunks so that you can study every concept with full concentration. 


#3 Do not rely only on text-based information. You need to visualise concepts to remember them for long. Taking notes, creating mind maps, using flashcards, etc. are some of the best techniques to remember tough concepts like Mechanics. 


Now, the D-W-M-Y formula! It stands for the following: 


D: Day 

W: Week 

M: Month 

Y: Year


So a concept that you learn today. You must revise it after D-W-M-Y that a Day, a Week, a Month, a Year! For example, if you studied the laws of motion on 12 July 2022. Then, you need to revise this topic as per the following:

  • Next revision after a Day: 13 July 2022
  • Next revision after a Week: 19 July 2022
  • Next revision after a Month: 11 August 2022
  • Next revision after a Year: 12 July 2023


Of course, you might revise a little earlier than a year. But, for the sake of simplicity, we are taking a year here. This formula will be suitable for Class 11 students who have started preparing for JEE 2024. But, if you are in Class 12 and have only one year to prepare, you may revise the topics a little earlier after a year, say, after 6 months, 8 months, or 10 months. 


The main idea behind this DWMY formula is to remind you that you need to revise a topic after some time in order to remember it. This formula also helps you in formulating a study strategy for JEE. You can decide your schedule in advance and keep your learning on track. 


How to revise Mechanics topics perfectly? 

Now that you know when to revise JEE Mechanics concepts, you must also know how to revise them. So, here are a few important tips. 


  • Make notes: Your notes help you in revision. Imagine reading the text-heavy chapters from Physics books every time you study Mechanics. It will be stressful. You might have to convince yourself a lot to pick that book up. Notes are easy to read and comprehend. They are illustrative, they include short, crisp points that help you revise a topic quickly. Different kinds of notes that you can create for Mechanics are: 
    • Revision notes 
    • Study guides
    • Mind maps 
    • Flashcards
    • Tables/charts 
    • Formula sheets 
    • Diagrams/ illustrations 


  • Practice questions: Since Mechanics would involve many numerical-based questions, it is better to practise them to revise how to apply the different formulas and concepts in different situations. You can use askIITians mechanics worksheets or daily practice papers for that. We have also created mock tests for JEE that will be useful for you. 


  • Take a test: If you think you know the concepts, why not take a test? You can ask your teachers to test you or you and your friends can quiz each other. This will help you understand which topics are clear to you and need more practice. At askIITians, we schedule regular tests for students so that they can revise different JEE concepts from time to time. 


  • Teach a friend: Here’s another great trick to ensure that you remember the Mechanics topics well. Teach your friends. You can decide to prepare a few topics each and then teach those topics to each other. This will strengthen your preparation and make learning much more fun! 


That’s all. These simple tricks will help you master the Mechanics for JEE Main and Advanced easily. If you need more help in understanding JEE Mechanics concepts, enrol in online coaching for JEE with us. We have the best teachers to guide you. Last, but not least, always be ready to learn. Do not consider learning or preparing for JEE a burden but a goal of your life! 


Frequently Asked Questions 


  • Which topics are included in JEE Mechanics?

JEE Mechanics 2022-2023 syllabus includes the following main topics: Physics and Measurement, Kinematics, Laws of Motion, Work, Energy and Power, Rotational Motion, and Gravitation. 


  • How many mechanics questions have been asked in JEE until now? 

In the previous 10 years, around 80 questions from Mechanics have been asked in JEE papers. 


  • I need help in studying for JEE, what should I do? 

You can enrol in the askIITians online coaching program for JEE and prepare under the guidance of our esteemed faculty. We provide personalised coaching for JEE Main and Advanced with comprehensive study materials, test series, live classes, doubt sessions, and a lot more! 


  • Which is the most important chapter in JEE Mechanics? 

Rigid Body Dynamics also known as Rotational Motion is one of the most important chapters in JEE Mechanics.


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Course Features

  • Video Lectures
  • Revision Notes
  • Previous Year Papers
  • Mind Map
  • Study Planner
  • NCERT Solutions
  • Discussion Forum
  • Test paper with Video Solution