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Second Law of Motion Video Lecture | Physics for Grade 9

FAQs on Second Law of Motion Video Lecture - Physics for Grade 9

1. What is the Second Law of Motion?

Ans. The Second Law of Motion, also known as Newton's second law, states that the force acting on an object is directly proportional to the mass of the object and the acceleration produced. Mathematically, it can be expressed as F = ma, where F is the force, m is the mass, and a is the acceleration.

2. How does the Second Law of Motion relate to everyday life?

Ans. The Second Law of Motion can be observed in everyday life. For example, when we push a heavy object, we need to exert more force to move it compared to a lighter object. Similarly, when we kick a football, the harder we kick it, the faster it accelerates due to the greater force applied.

3. What are the units of force, mass, and acceleration in the Second Law of Motion?

Ans. In the SI system, the unit of force is the Newton (N), which is equal to kg·m/s². The unit of mass is kilogram (kg), and the unit of acceleration is meters per second squared (m/s²).

4. How does mass affect the acceleration of an object according to the Second Law of Motion?

Ans. According to the Second Law of Motion, mass and acceleration are inversely proportional. This means that if the mass of an object increases, the acceleration it experiences decreases, provided the force acting on it remains constant. Similarly, if the mass decreases, the acceleration increases.

5. Can you give an example that illustrates the Second Law of Motion?

Ans. Sure! Let's consider a scenario where two cars with different masses are pushed with the same force. The car with less mass will experience a greater acceleration compared to the car with more mass. This is because the force is divided by a smaller mass, resulting in a larger acceleration according to the Second Law of Motion.

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Sep 10, 2025 Last updated

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