NCERT Laws of Motion: Line-by-Line Analysis for NEET

Learning Newton’s Laws of Motion is a game changer for NEET Physics! These fundamental principles not only tell us how the world around us works but are used in many NEET questions. Together, we’ll break them down step by step!

It aims to simplify every line in the NCERT textbook for the Laws of Motion. We will take you through every concept, whether you’re struggling with friction or confused about how to apply Newton’s laws to get you clearer and more confident.

Here’s what you’ll gain:

• Key Laws of Motion concepts from NCERT are in a line-by-line breakdown.
• How to tackle NEET-style questions.
• Strategies to solve numerical problems more quickly and more accurately.

you will have a good foundation to attack Laws of Motion questions with ease! 

Understanding the Importance of Laws of Motion in NEET

NEET Physics is completely based on the Laws of Motion. It introduces some key concepts that are the basics for understanding the more advanced topics of work, energy, power, and gravitation. These principles must be mastered because they are directly related to many practical and theoretical problems in Physics.

Weightage in NEET

NEET exam relies highly on the laws of motion. Expect at least 2-3 questions based on concepts like motion, inertia, force, etc. you can definitely score 8-12 marks. The questions in these problems are often straightforward applications of formulae, which makes them easy to score if your basics are good. Below are the kinds of questions which are asked frequently: 

• Theoretical Questions: These are tests of your understanding of Newton’s laws and their application.
• Numerical Problems: This covers calculating force, acceleration, or friction in different situations.
• Application-Based Questions: Problems related to the motion of objects on inclined planes and under multiple forces.

Why NCERT is Essential for NEET Prep

The gold standard for the preparation of NEET is NCERT textbooks. The Laws of Motion are explained in a simple, easy-to-understand language, with examples that make difficult concepts easier to understand. A majority of the NEET questions are based on the NCERT text, diagrams, and exercises. If you thoroughly study the NCERT, you get a strong base that provides you with the required confidence to solve even the trickiest problems.

In short, NEET Physics can be aced only if you know the Laws of Motion very well!

Newton’s First Law: The Law of Inertia

Newton’s First Law, also called the Law of Inertia, states: “If an external force acts on an object, the object will remain at rest or continue to move in a straight line at a constant speed.” This, therefore, means that objects tend to resist anything that has the tendency to change their motion, and this is called inertia.

Key Concepts

• Inertia: The ability of an object to resist change in its state of motion.
• Force: It had to be caused by some external influence to move or stop.
• Equilibrium: A state in which all forces acting on an object cancel each other and no motion occurs.

Real-Life Examples

• Inertia means that passengers lurch forward when a car suddenly stops. The car has stopped, but their bodies want to keep moving.
• A book on a table does not move unless it is moved by someone.

Tips for NEET

• Theoretical questions that ask about the Law of Inertia are the focus. For example, "What happens to a passenger on a moving bus when it suddenly stops?"
• Learn the concepts with real-life examples. It will help you to remember answers during the exam.
• Practice identifying objects in equilibrium and how forces balance out to keep an object in motion.

Newton’s First Law is understood from the Laws of Motion chapter and is important for building a solid physics foundation and solving theoretical and application-based NEET questions.

Newton’s Second Law: Force and Acceleration

One of the most important concepts in Physics is Newton’s Second Law of Motion. It states that: 

F = ma

Where:

• The force applied to an object is F.
• m is the mass of the object,
• The acceleration produced is a.

It is this law that tells us that the force required to move an object is directly proportional to its mass and acceleration. In simpler terms, the more force that you apply, the faster the object will accelerate, and the heavier the object, the more force you have to apply to get it moving.

Applications

• Pushing a shopping cart: The faster it accelerates (the more force), the harder you push. The heavier the cart, the more force you’ll need to apply to get the same acceleration.
• Car acceleration: The car accelerates when you press the gas pedal. The heavier the car (more mass) is more force you need to accelerate.
• NEET-style Numerical Problems: These problems usually require you to solve for force, mass, or acceleration given values. For instance, if you know the mass and the acceleration, then you can determine the force by using the formula 𝐹=𝑚𝑎.

Problem-Solving Tips

• Identify the given quantities: The first thing you have to do is to write down what is given in the question (force, mass, acceleration).
• Use the formula: Plug the known values into 𝐹=𝑚𝑎. In order to find a force, you multiply mass by acceleration. To find acceleration, you divide the force by mass.
• Unit check: Always check your units. The mass should be in kilograms (kg), acceleration should be in meters per second squared (m/s²), and force should be in newtons (N).

Newton’s Third Law: Action and Reaction

For every action, there is an equal and opposite reaction. What this means is that whenever one object exerts a force on another, the second object will also exert an equal and opposite force. The magnitude of these forces is always equal but opposite in direction, and they act on different objects.

Examples

• Rockets: The action, in this case, is the force that the gas being pushed out of the rocket exerts downwards, and the reaction is the rocket being pushed upwards.
• Swimming: When a swimmer moves forward through the water, they push the water backward with their hands and feet (action), and they then move forward (reaction).
• The recoil of a Gun: The bullet is pushed forward (action) by a gun when it fires a bullet, and the gun experiences a backward force (reaction).

NEET Strategy

• Identifying application-based questions: On NEET, they often ask how the third law works in real-life scenarios, such as rockets or swimming. Questions relating to forces on different objects or systems will also be a good source of questions.
• Use examples to understand the concept: Practice questions with real-life applications that show how action and reaction forces affect movement.

Do you want to solve most NEET questions based on Newton’s third law of motion? 

All details about Newton’s law of motion are in the PrepMed youtube channel. 

Conclusion

It is very important to master the Laws of Motion for the NEET exam. These fundamental principles not only help you solve physics problems but also get you ready for future topics in mechanics. If you practice regularly and refer to your NCERT textbook as your main source, then you will have a strong base to prepare for NEET.

So remember, practice consistently, solve problems in steps, and focus on the important concepts. You will be able to understand and apply the laws of motion. Revising and practicing will make you improve significantly.