## Conservation of Momentum – Class 11 | Chapter – 5 | Physics Short Notes Series PDF for NEET & JEE

Conservation of Momentum: The conservation of momentum is a fundamental principle of physics that states that the total momentum of a system remains constant if there are no external forces acting on the system. This means that the momentum of an object or a group of objects cannot change unless there is a net external force acting on the system. In other words, the total momentum of an isolated system is conserved. Momentum is the product of an object’s mass and its velocity. Mathematically, momentum can be expressed as p = mv, where p is momentum, m is mass, and v is velocity.

## Applications of Conservation of Momentum

The conservation of momentum has important applications in various fields of physics, including mechanics, electromagnetism, and thermodynamics. Some of the significance of the conservation of momentum are:

• Understanding collisions: It is essential for understanding collisions between objects. When two objects collide, the total momentum of the system remains constant, even if the objects’ individual momenta change.
• Rocket propulsion: It also plays a significant role in rocket propulsion. A rocket expels gas out the back at high speeds, creating an equal and opposite force on the rocket, which propels it forward.
• Ballistics: It is used to study the trajectory of bullets and other projectiles in ballistics.
• Particle physics: It is a fundamental principle in particle physics, where it is used to study the behavior of subatomic particles.
• Conservation of energy: It is closely related to the conservation of energy, as both principles are based on the laws of physics.

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