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FAQs on DC Pandey Solutions (JEE Advance): Laws of Motion- 1 - DC Pandey Solutions for JEE Physics

1. What are the three laws of motion?
Ans. The three laws of motion, also known as Newton's laws of motion, are as follows: 1. Newton's First Law of Motion: An object at rest tends to stay at rest, and an object in motion tends to stay in motion with the same speed and in the same direction unless acted upon by an external force. 2. Newton's Second Law of Motion: The acceleration of an object is directly proportional to the net force acting on it and inversely proportional to its mass. It can be stated as F = ma, where F is the net force, m is the mass of the object, and a is its acceleration. 3. Newton's Third Law of Motion: 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.
2. What is the significance of Newton's laws of motion?
Ans. Newton's laws of motion are fundamental principles that describe the motion of objects. They have great significance in physics and engineering as they provide a framework for understanding and analyzing the behavior of objects under the influence of forces. These laws help in predicting and calculating the motion of objects, determining the forces involved, and designing systems and structures that rely on the principles of motion.
3. How do Newton's laws of motion apply to real-life situations?
Ans. Newton's laws of motion apply to various real-life situations. Some examples include: 1. First Law: A car comes to a stop when the brakes are applied because an external force (friction) acts opposite to its motion, causing it to slow down and eventually stop. 2. Second Law: The force exerted by a person while pushing a heavy object determines its acceleration. The larger the force, the greater the acceleration, and vice versa. 3. Third Law: When a person jumps off a boat, they push the boat backward. According to Newton's third law, the boat exerts an equal and opposite force on the person, propelling them forward.
4. How are Newton's laws of motion related to inertia?
Ans. Newton's laws of motion are closely related to the concept of inertia. Inertia is the tendency of an object to resist changes in its state of motion. It is directly addressed in Newton's first law, which states that an object at rest remains at rest, and an object in motion continues moving with constant velocity unless acted upon by an external force. Inertia can be thought of as the resistance an object offers to changes in its motion, and it is a fundamental property of matter.
5. Can Newton's laws of motion be applied to objects moving at speeds close to the speed of light?
Ans. Newton's laws of motion are valid for objects moving at speeds much lower than the speed of light. However, they are not applicable to objects moving at speeds close to the speed of light. At high speeds, the theory of special relativity, developed by Albert Einstein, becomes necessary to accurately describe the motion of objects. The laws of motion derived from special relativity, such as time dilation and length contraction, differ from Newton's laws and are essential for understanding the behavior of objects at relativistic speeds.
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