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

Newton Third Law of Motion: Newton’s Third Law of Motion states that for every action, there is an equal and opposite reaction. This law means that when one object exerts a force on another object, the second object will exert an equal and opposite force back on the first object.

## Significance of Newton Third Law of Motion

The Newton Third Law of Motion is significant because it explains the nature of forces and interactions between objects. It has important applications in various fields such as physics, engineering, and mechanics. Some of the significance of Newton’s Third Law of Motion includes:

• Understanding of motion: The Third Law of Motion helps us understand how forces affect motion. It explains how objects interact with one another and how forces act in pairs.
• Design of machines and equipment: The Third Law of Motion is essential for designing machines and equipment that require the use of forces. Engineers use this law to design machines that can generate forces and that can withstand forces.
• Conservation of momentum: The Newton Third Law of Motion also helps explain the principle of conservation of momentum. When two objects interact, their total momentum remains constant, according to the Third Law of Motion.
• Impact on other fields: The Newton Third Law of Motion has applications in various fields such as aviation, automotive, and sports. For example, it is used to design and develop more efficient airplane engines, to improve the safety of automobiles, and to study the mechanics of athletic movements.

## Applications of Newton Third Law of Motion

Newton Third Law of Motion has numerous applications in various fields. Some of the applications of this law are:

• Rocket propulsion: The Third Law of Motion is fundamental to rocket propulsion. When a rocket engine expels gas out the back of the rocket, the gas pushes the rocket forward, while the rocket simultaneously pushes the gas backward, according to the Third Law of Motion.
• Recoil of firearms: When a firearm is fired, the bullet is propelled forward with a force, and the firearm recoils backward with an equal and opposite force, as per the Third Law of Motion.
• Action-reaction in sports: The Third Law of Motion can be seen in many sports. For example, a basketball player can jump higher by pushing down harder on the ground with their legs, as the ground pushes back with an equal and opposite force.
• Swimming: The Third Law of Motion also applies to swimming. A swimmer pushes water backward with their hands and feet, and the water pushes the swimmer forward with an equal and opposite force.
• Car safety: The Third Law of Motion plays a crucial role in car safety. In the event of a car crash, the car exerts a force on the object it hits, and the object exerts an equal and opposite force back on the car. This is why safety features such as seat belts and airbags are essential to protect occupants from the impact.

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