FAQs on Laws of Motion in One Shot (NCERT) Video Lecture - Physics Class 11 - NEET
|1. What are Newton's three laws of motion?
Ans. Newton's three laws of motion are:
1. First law of motion (Law of Inertia): 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. Second law of motion (Law of Force and Acceleration): The acceleration of an object is directly proportional to the net force applied to it and inversely proportional to its mass. It can be expressed as F = ma, where F is the net force, m is the mass, and a is the acceleration.
3. Third law of motion (Law of Action and Reaction): For every action, there is an equal and opposite reaction. This means that whenever one object exerts a force on a second 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 significant because they form the foundation of classical mechanics and explain the basic principles of motion. These laws help in understanding the behavior of objects under the influence of external forces. They have practical applications in various fields such as engineering, physics, and even everyday life. Newton's laws of motion allow us to calculate and predict the motion of objects, determine forces acting on them, and explain phenomena like gravity, friction, and collisions.
|3. How do Newton's laws of motion relate to everyday life?
Ans. Newton's laws of motion are applicable to everyday life in several ways:
- First law: The first law of motion explains why objects tend to stay at rest or keep moving at a constant speed unless acted upon by external forces. For example, when a car suddenly stops, passengers lunge forward due to inertia.
- Second law: The second law of motion helps us understand the relationship between force, mass, and acceleration. It explains how much force is required to accelerate or decelerate an object. For instance, pushing a heavier shopping cart requires more force to accelerate it.
- Third law: The third law of motion explains the concept of action and reaction. It helps us understand why we move backward when we release air from a balloon or why a rocket moves forward by expelling gases backward.
|4. How does Newton's second law of motion relate to sports?
Ans. Newton's second law of motion is relevant to sports in various ways:
- It helps explain how athletes generate acceleration and force to perform actions like running, jumping, throwing, or kicking. For example, when a soccer player kicks the ball, the force applied determines the ball's acceleration.
- The second law also explains the effect of mass on an athlete's performance. Lighter athletes can often achieve greater acceleration compared to heavier athletes for the same applied force.
- Understanding the second law helps coaches and trainers design training programs to improve an athlete's performance by focusing on increasing force production, improving technique, or optimizing body mechanics.
|5. Can you give an example of Newton's third law of motion?
Ans. An example of Newton's third law of motion is the recoil of a gun. When a gun is fired, the bullet is propelled forward with a certain force. Simultaneously, the gun experiences an equal and opposite force in the backward direction, resulting in recoil. This is because the bullet exerts a force on the gun, and according to Newton's third law, the gun exerts an equal and opposite force on the bullet.