NCERT Solutions for Class 11 Physics Chapter 5
The Motion of a Particle was the main focus of the previous chapter. We learned that uniform motion is governed by velocity, while non-uniform motion is governed by acceleration. So far, we haven’t considered what governs body motion. In this chapter, this is turned into a basic question.
In Class 11 Physics Ch 5, students learn about the Laws of Motion in depth. The Aristotelian principles of motion are first explained in this chapter. Then it looks at Galileo Galilei’s investigation of the law of inertia in the seventeenth century. After that, the chapter delves into Newton’s law of motion. The chapter then goes over the conservation of momentum and how it relates to Newton’s laws.
There are practise questions and exercises at the end of the chapter to help students gauge their understanding of the concepts read so far. If you are looking for answers to these practise questions, check out NCERT Solutions for Class 11 Physics Chapter 5 on Extramarks.
NCERT Solutions for Class 11 Physics Chapter 5 – Law of Motion
To easily understand the complex concepts discussed in the chapter, students need to invest in reliable NCERT Solutions Class 11 Physics Chapter 5. At Extramarks, the NCERT Solutions for Class 11 Physics Chapter 5 are created with accurate and authentic information that is strictly based on the most recent term – I CBSE Curriculum. Let’s look at the NCERT solutions for Laws of Motion in class 11.
Let’s take a look at the topics and subtopics covered in this chapter:
| Section Number |
Section Title |
| 5.1 |
Introduction |
| 5.2 |
Aristotle’s Fallacy |
| 5.3 |
The Law of Inertia |
| 5.4 |
Newton’s First Law of Motion |
| 5.5 |
Newton’s Second Law of Motion |
| 5.6 |
Newton’s Third Law of Motion |
| 5.7 |
Conservation of Momentum |
| 5.8 |
Equilibrium of a Particle |
| 5.9 |
Common Forces in Mechanics |
| 5.10 |
Circular Motion |
| 5.11 |
Solving Problems in Mechanics |
5.1 Introduction
This topic summarises what we’ve learned so far about the Laws of Motion and what we’ll learn in this Chapter.
5.2 Aristotle’s Fallacy
Aristotle’s Fallacy Theory is used to describe a logically flawed argument. According to this theory, a body must be propelled forward by an external force.
5.3 The Law of Inertia
This law states that an object does not want to change its state of rest or of motion unless compelled by an external unbalanced force to do so..
5.4 The First Law of Motion (Newton’s First Law)
This law states that unless compelled by an external force, an object remains at rest or in uniform motion in a straight line.
5.5 The Second Law of Motion (Newton’s Second Law of Motion)
According to this law, an object’s acceleration is proportional to the unbalanced force applied to it. Momentum is the thrust produced by a body, which is equal to the product of its mass and velocity. The impact force that generates for a short period of time is referred to as an impulse. It is, however, powerful enough to alter the object’s momentum.
Objects in motion or at rest, in simple terms, repel changes in their state of motion.
5.6 The Third Law of Motion (Newton’s Law)
According to this law, every action has an equal and opposite reaction. In addition, the action and reaction have the same magnitude. Furthermore, forces are always found in pairs.
5.7 Conservation of Momentum
This law states that the momentum of two objects remains constant before and after an event occurs. However, the objects will move in the same direction as the heavier object. Furthermore, this force is zero.
5.8 Equilibrium of Particle
This is the state of a particle or object when it is not moving or rotating. Furthermore, this necessitates the sum of movements commonly referred to as torque.
5.9 Common Forces in Mechanics
This topic discusses the various forces that act on mechanical objects.
5.9.1 Friction- Friction is the force that opposes an object’s relative motion.
- The friction that keeps the body at rest is known as static friction.
- Impending Motion: This is a motion that is about to happen but does nothing when force is applied to it.
- Rolling Friction: A rolling round object will not encounter any friction, according to rolling friction.
5.10 Circular Motion
This topic discusses how an object moves around the circumference of a circle. In addition, this topic explains circular motion using a car as an example.
5.11 Solving Problems in Mechanics
These topics define the various approaches to solving the mechanics problems.
NCERT Exercise Class 11 Chapter 5 Laws of Motion – All Questions
The NCERT Solutions Class 11 cover a wide range of topics, from Kinematics and Gravitation to Rotational Motion and Mechanical Properties of Fluids. Newton’s Laws of Motion is one such topic that explains what happens around us on a daily basis. Newton’s three physical laws that laid the foundation for classical mechanics are referred to as the Laws of Motion. They also define a body’s relationship to the force acting on it.
Significance of Laws of Motion
Having an understanding of concepts related to the Laws of Motion is not only necessary for school and competitive exams, but it also aids in understanding a wide range of activities that occur on a daily basis.
These laws explain why things move or stay still, such as why you don’t float out of bed or fall through your house’s floor. Newton’s laws govern how cars work, how water flows, why buildings don’t collapse, and how everything else moves around us. Newton’s laws apply to all forces in general, but in order to apply them to a specific problem, you must first understand all of the forces involved, such as friction, gravity, and tension.
If you choose to study physics in college, you will undoubtedly learn how to apply these laws to real-life problems. In high school, you usually do simpler examples, such as how a ball flies through the air. But even that is essential if you enjoy playing basketball! If you really want to land a spaceship on the moon, you’ll have to work a lot harder in school.
The Three Laws of Motion Proposed by Newton
Law one explains that if the net external force is zero, a body at rest remains at rest, and a body in motion maintains its uniform velocity. The term for this property of the body is Inertia. The term Inertia refers to a person’s unwillingness to change. A body remains in the state of rest or uniform motion unless it is compelled to change the state by an external force.
Law two states that when a body’s net external force is zero, its acceleration is also zero. Only if the body is subjected to a net external force can acceleration be non-zero. The rate of change of momentum of a body is proportional to the applied force and occurs in the direction of action of force. According to the third law, every action has an equal and opposite reaction.
Basic Ideas That Class 11 Physics Chapter 5 Explains
In this chapter, students will learn about moving bodies and the forces that act on them. They will also learn about the direction of these moving bodies and their corresponding motion, as well as the gravitational effect on these bodies, and so on.
The associating/linking of an object’s motion and the forces acting on it is indicated by Newton’s Laws of Motion. Motions laws The Class 11 Physics Chapter 5 NCERT Solutions discusses how reactions are a two-way mechanism. The three basic Laws of Motion proposed by Newton are also explored in these solutions. It also tries to connect these laws to real-life scenarios. Because it can be difficult to understand the theories that underpin the laws, it is always a good idea to have NCERT Solutions, which Extramarks provides.
Why should one refer to Extramarks for NCERT textbook solutions?
Class 11 Physics includes formulae and essential concepts that form the foundation for the syllabus of Class 12. Students can excel in your class and gain a good amount of confidence to tackle the most important years of their school with the NCERT Solutions Class 11 Physics Chapter 5.
The solutions not only assist you in better understanding the subject but also prepare you for intellectual thinking and generate curiosity about the subject. Students have a variety of doubts when solving problems, and our subject experts have prepared NCERT solutions to address those doubts. Here are some benefits you can look at when you choose Extramarks as your companion for studies.
- These solutions are created using the blueprint given by CBSE which gives an idea of the marks distribution
- In-depth solutions allow students to grasp concepts more quickly.
- For the numerical in this chapter, step-by-step explanations have been provided.
- To increase the confidence of students, simplified and logical language is used in preparing the solutions.
- Wherever possible, students are given visual representations to help them grasp concepts more quickly.