Law of conversation of momentum is one of the general law of physics.  The momentum that normally characterizes the motion does not change in isolated objects.  The momentum of a certain object equals to the mass of that object when multiplied with the speed equal to the force that is required to bring the specified object to a stop.  Conservation can be referred to as anything that does not change.  The three major quantities that are conserved are momentum, angular momentum, and the energy. Conservation of the momentum is used to describe the collisions of objects. However, the collision of objects happens only on the isolated system of objects. The conservation of momentum can be written as P1i +P2i+….=P1f +….. where i and f represent the first and last momenta of a specified object. The conservation of momentum is a direct result of Newton’s third law. When the two objects collide, there is a force in one object due to the other object but when we apply Newton’s third law, the conclusion is there is an equal force in opposite direction. The force is normally present when the objects are in contact.  The length of the time objects become contact normally depends on a specific situation. The impulse of the specified objects is equal to the size and the opposite in the direction.

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