DC Pandey Solutions (JEE Advance): Laws of Motion- 2 | DC Pandey Solutions for JEE Physics PDF Download

Ans. The three laws of motion, also known as Newton's laws of motion, are as follows: 1. Newton's first law of motion states that an object at rest will remain at rest, and an object in motion will continue to move at a constant velocity, unless acted upon by an external force. 2. Newton's second law of motion states that the acceleration of an object is directly proportional to the net force acting on it and inversely proportional to its mass. It can be mathematically represented as F = ma, where F is the net force, m is the mass of the object, and a is the acceleration produced. 3. Newton's third law of motion states that for every action, there is an equal and opposite reaction. This means that whenever an object exerts a force on another object, the second object exerts an equal and opposite force on the first object.

Ans. Newton's laws of motion can be applied to various everyday life situations. Here are a few examples: 1. When we push a shopping cart, Newton's second law of motion is at play. The force we apply (action) on the cart causes it to move forward (reaction). 2. When a car suddenly stops, the passengers tend to move forward due to their inertia (Newton's first law), until a seatbelt or the dashboard applies a force to stop their motion. 3. When a person jumps off a diving board, they experience an upward force from the board (reaction) that propels them into the air (action), following Newton's third law.

Ans. Newton's laws of motion describe the relationship between motion and forces. The laws explain how forces affect the motion of an object. Here's how they are related: 1. Newton's first law states that an object at rest or in motion will remain so unless acted upon by an external force. It explains the concept of inertia, which is the resistance of an object to changes in its motion. In this law, forces are necessary to change the motion of an object. 2. Newton's second law relates the net force applied to an object with its acceleration. It explains how forces cause objects to accelerate or decelerate. The law states that the acceleration of an object is directly proportional to the net force acting on it and inversely proportional to its mass. 3. Newton's third law states that for every action, there is an equal and opposite reaction. It shows that forces always occur in pairs and act on different objects. This law demonstrates how forces interact with each other.

Ans. The laws of motion can be used to solve various physics problems by applying them in different scenarios. Here's a general approach to solving problems involving Newton's laws of motion: 1. Identify the forces acting on the object and their directions. 2. Determine the net force acting on the object by considering the vector sum of all the forces. 3. Apply Newton's second law (F = ma) to relate the net force, mass of the object, and its acceleration. 4. Use the given information or equations to find the value of either the net force, mass, or acceleration. 5. Apply the appropriate law of motion (first, second, or third) to analyze the motion or forces involved in the problem. 6. Solve the problem by substituting the known values into the relevant equations and calculating the required unknown quantities.

Ans. Understanding the laws of motion is crucial in physics for several reasons: 1. Predicting and analyzing the motion of objects: The laws of motion provide a framework to understand and predict how objects move when forces are applied to them. They help in analyzing the trajectory, speed, and acceleration of objects in various scenarios. 2. Designing and improving technologies: Knowledge of the laws of motion is essential in designing and improving technologies like vehicles, machines, and structures. Engineers and designers rely on these laws to ensure the safety, efficiency, and functionality of their creations. 3. Solving real-world problems: The laws of motion are applicable to a wide range of real-world problems, from understanding the flight of airplanes to analyzing the behavior of planets in space. They provide a systematic approach to problem-solving and help in making accurate predictions. 4. Advancing scientific research: The laws of motion are fundamental principles in physics and serve as a basis for many other concepts and theories. Understanding these laws enables scientists to delve deeper into various branches of physics, such as mechanics, astrophysics, and fluid dynamics, leading to new discoveries and advancements in scientific research.