Check for me this solution in General Physic

In summary, the concept of conservation of linear momentum applies to objects with a net force of zero. However, in the case of an object experiencing gravity, the total net force is still present and is equal to mg. This is a concern in the given exercise, which focuses on momentum and avoids the force of gravity.
  • #1
vuvan
4
0
I reckon that we only apply conservation of linear momentum for object which has total net force acting on equal zero but in this case , the gravity force still exist , total net force is mg
Thank in advance
 
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  • #2
vuvan said:
I reckon that we only apply conservation of linear momentum for object which has total net force acting on equal zero but in this case , the gravity force still exist , total net force is mg
Thank in advance

Is there a missing illustration? Because you haven't presented a problem.
 
  • #4
I was not upset; I was only pointing out why you were not getting replies.

vuvan said:
I reckon that we only apply conservation of linear momentum for object which has total net force acting on equal zero but in this case , the gravity force still exist , total net force is mg
Thank in advance

I think I understand your concern. The question seems to me to be written to avoid the force of gravity by stating "right after the explosion." The focus is on momentum. Gravity only enters into what you posted in the Exercise, even then it's a path that's straight up and down and only asks about "the center of mass."
 
  • #5


In General Physics, the conservation of linear momentum is a fundamental principle that states that the total momentum of a closed system remains constant. This means that in the absence of external forces, the total momentum of the system before and after an interaction must be the same.

In the case mentioned, where gravity force is still present, the total net force on the object is not equal to zero. However, this does not contradict the conservation of linear momentum. This is because the force of gravity, mg, is an external force acting on the system. As long as the system is closed and there are no other external forces acting on it, the total momentum of the system will still be conserved.

Therefore, we can still apply the conservation of linear momentum in this case. It is important to note that the force of gravity does not violate the principle of conservation of linear momentum, as it is an external force and not a force within the system itself.
 

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