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

1. What are the three laws of motion?
Ans. The three laws of motion, formulated by Sir Isaac Newton, are as follows: 1. Newton's First Law of Motion: Also known as the law of inertia, it 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: It states that the force acting on an object is directly proportional to the rate of change of its momentum and occurs in the direction of the applied force. Mathematically, F = ma, where F is the force, m is the mass, and a is the acceleration. 3. Newton's Third Law of Motion: It states that for every action, there is an equal and opposite reaction. When one object exerts a force on another object, the second object exerts an equal and opposite force on the first object.
2. How can the laws of motion be applied in everyday life?
Ans. The laws of motion have numerous applications in everyday life. Some examples include: 1. Seatbelts in cars: Newton's first law of motion explains why wearing seatbelts is crucial. In the event of sudden braking or collision, the seatbelt prevents the passengers from moving forward due to their inertia. 2. Rocket propulsion: Newton's third law of motion is applied in rocket propulsion. The expulsion of gases in the opposite direction creates a reaction force propelling the rocket forward. 3. Sports activities: The laws of motion are evident in various sports activities. For instance, kicking a football involves the application of Newton's third law, where the force exerted on the ball is equal and opposite to the force exerted by the ball on the foot. 4. Swimming: Newton's third law is also observed while swimming. By pushing the water backward with the arms and legs, an equal and opposite reaction force propels the swimmer forward.
3. How can one calculate the force using Newton's second law of motion?
Ans. According to Newton's second law of motion, the force acting on an object can be calculated using the formula F = ma, where F is the force, m is the mass of the object, and a is the acceleration produced. If the mass of the object and its acceleration are known, multiplying them will give the force acting on the object.
4. What is the significance of Newton's laws of motion in physics?
Ans. Newton's laws of motion form the foundation of classical physics. Their significance lies in the fact that they provide a framework to understand the motion of objects and the forces acting upon them. These laws explain how objects move, interact with each other, and respond to external forces. Newton's laws of motion are applicable in various fields of science and engineering, enabling predictions and calculations related to motion, mechanics, and dynamics.
5. Can the laws of motion be violated?
Ans. Under normal circumstances, the laws of motion are not violated. However, there are certain situations where they may appear to be violated due to external factors. For example, if an object is subjected to extreme forces or interactions with other objects, the laws of motion may not accurately describe its behavior. Additionally, at the quantum level, the laws of motion are modified by quantum mechanics. Overall, in everyday scenarios and macroscopic objects, the laws of motion hold true.
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