# GENERAL KNOWLEDGE

## GK

### PHYSICS

 Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
If no external force acts on a system of bodies, the total linear momentum of the system of bodies remains constant. Which law states this?
 A Newton first law B Newton second law C Newton third law D Principle of conservation of linear momentum
Explanation:

Detailed explanation-1: -Conservation of momentum is a fundamental law of physics which states that the momentum of a system is constant if there are no external forces acting on the system. It is embodied in Newtonâ€™s first law (the law of inertia).

Detailed explanation-2: -Conservation of Linear Momentum Formula The principle of conservation of momentum states that if two objects collide, then the total momentum before and after the collision will be the same if there is no external force acting on the colliding objects.

Detailed explanation-3: -Therefore if no external force is acting on a body, a body will either remain in state of rest or uniform motion.

Detailed explanation-4: -If there are no external forces acting on this system (consisting of the two masses) the total momentum of the system is conserved. The first class of collisions we will discuss are the elastic collisions. Collisions are called elastic collisions if the total kinetic energy of the system is conserved.

There is 1 question to complete.