## Newton Second Law of Motion – Class 11 | Chapter – 5 | Physics Short Notes Series PDF for NEET & JEE

Newton Second Law of Motion: Newton’s Second Law of Motion states that the force acting on an object is equal to the mass of the object multiplied by its acceleration. This law can be expressed mathematically as:

F = m*a

where F is the force applied to the object, m is the mass of the object, and a is the acceleration produced by the applied force.

This law explains how the motion of an object changes when a force is applied to it. The greater the force applied, the greater the acceleration produced in the object. However, the acceleration also depends on the mass of the object. A larger mass will require a greater force to produce the same acceleration as a smaller mass.

## Significance of Newton Second Law of Motion

The Second Law of Motion is significant because it provides a quantitative measure of the relationship between force, mass, and acceleration. It is a fundamental law of physics that describes how the motion of an object changes when a force is applied to it. The significance of the Second Law of Motion can be explained as follows:

• Prediction of motion: The Second Law of Motion enables us to predict the motion of an object when we know the applied force and the mass of the object. By calculating the acceleration produced by the applied force, we can determine the motion of the object.
• Design of machines and equipment: The Second Law of Motion is essential for designing machines and equipment that require a certain amount of force to produce a desired acceleration. Engineers use this law to design and develop machines that can lift heavy loads, generate power, and perform other functions.
• Understanding of the behavior of objects: The Second Law of Motion helps us understand the behavior of objects in motion. By studying the relationship between force, mass, and acceleration, we can predict how an object will move and how it will react to different forces.
• Impact on other fields: The Second Law of Motion has applications in various fields such as astronomy, sports, and medicine. For example, it is used to study the behavior of celestial objects, the movement of athletes, and the impact of external forces on the human body.

## Application of Newton Second Law of Motion

Newton second law of motion is applied to identify the amount of force needed to make an object move or make it stop. Following are a few examples that we have listed to help you understand this point:

• Kicking a ball: When we kick a ball, we exert force in a specific direction. The stronger the ball is kicked, the stronger the force we put on it and the further away it will travel.
• Pushing a cart: It is easier to push an empty cart in a supermarket than a loaded one, and more mass requires more acceleration.
• Two people walking: Among the two people walking, if one is heavier than the other, the one weighing heavier will walk slower because the acceleration of the person weighing lighter is greater.

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