In conservation of momentum,it is said that there is no external force acting, so how will the bodies collide?
And how will the momentum before and after collision be same?

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Solution

If bodies are moving with uniform velocity then there is no force acting on the body,and two bodies moving with same speed can collide.

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If Linear momentum is defined as 'mass x speed', can we state a principle of conservation of linear momentum as 'linear momentum of a system remains constant if no external force acts on it?

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Q. The total momentum 'p' of two balls remain conserved after they collide because the net external force acting on the system is .

Q. A block moving in air, explodes into two parts. Then just after explosion (neglect change in momentum due to gravity)

Statement

1

:- The total momentum of the two parts must be equal to the momentum of the block before explosion.

Statement

2

:- If no external force acts on a system, then the linear momentum of the system will be conserved.

The total momentum of a system always remain unchanged before and after the collision regardless of the external forces acting on the system.

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In conservation of momentum,it is said that there is no external force acting, so how will the bodies collide? And how will the momentum before and after collision be same?

If bodies are moving with uniform velocity then there is no force acting on the body,and two bodies moving with same speed can collide.

In conservation of momentum,it is said that there is no external force acting, so how will the bodies collide?
And how will the momentum before and after collision be same?