Mechanics is the foundation on which the entire structure stands. A good grip on Mechanics empowers a student to get a good start in any problem of physics
along with its own weightage in JEE Main and JEE Advanced. The first golden rule of Mechanics is very simple — draw the free body diagram (FBD), then solve the problem. An FBD is not a formality; it is the master key to the entire problem. Solving a problem without an FBD is like aiming with closed eyes. Newton’s laws should not be memorised as mere statements; they should become your thinking framework. In every question, ask yourself only two things: what is the net force on the object and in which direction, and in which direction will the net acceleration act? Once these two answers are clear, half the solution appears on its own. Take care of lazy nature of spring force. Friction is an intelligent force in which magnitude and direction are self-adjusting. It is not always μN. Once this idea is clear, problems on limiting friction and rolling or sliding motion become much easier. In circular motion, do not treat centripetal force as a separate new force. It is simply the radial component of already existing forces. Once this clicks, problems on rotating bodies, loop-the-loop, banked roads and conical pendulum become very straightforward. Take care of vertical circular motion which is one of the most important ingredient of past JEE papers. Use the concpt of centrifugal force cautiously. Do not treat the work–energy theorem and conservation of momentum as the last option. Make them your first tools, especially when forces look complicated or motion is changing. Many tough-looking questions finish in two lines using only these principles. Centre of mass acts as a bridge connecting particle and rigid body dynamics. This chapter is building block of real world physics and engineering. Take care of locations of com in various standard system, Linear momentum conservation, and collision along with problems based on variable mass system. Rigid body dynamics seems to be a tough nut to crack but if you go systematic on calculation of moment of inertia, torque and angular momentum, it will become one of the most scoring part of physics. It opens a gateway to real world mechanics. Three quick rules to adopt from today:
- Practice relevant problems based on recent trend of JEE.
- Start a question with schematics and a mind map.
- Be quick, but accurate as well.
Today’s practice plan
Solve only 20 Mechanics questions, but draw the free-body diagram with each one. First solve without time pressure, then solve the similar questions again with a timer. Your speed and accuracy will grow together.
Remember, Mechanics is not a difficult topic. It is a disciplined way of thinking. Structured thinking, accuratediagrams and regular practice, that is the sure-shot formula for a strong score.
(Inputs from Nitin Vijay, Educator and Founder, Motion Education, Kota)
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