Law of conservation of linear momentum is usually appplicable in an isolated system.Explain why under certain conditions this law is applicable even if the system is not completely isolated?
2006-11-25 06:01:46 · 4 answers · asked by hash 1 in Science & Mathematics ➔ Physics
In an isolated system (one where there are not external forces) the total momentum will be constant. There is not any exception.
If an external force is acting on a mechanical system, second law of Newton is applied:
total external force = (total mass)*(acceleration of center of mass)
2006-11-25 06:11:14 · answer #1 · answered by Anonymous · 0⤊ 0⤋
Internal forces can lead to an increase the acceleration of a system. Net external force would be zero for an isolated system. Consider for example a unstable Uranium atom at rest, for argument sake. When the atom explodes into tinier atoms, the split atoms will each run away into opposite directions with their speeds inversely proportional to their masses. Similar is the case here. Since the sand flies away in the opposite direction, the remaining trolley system will gain velocity because of this.
2016-05-23 01:40:17 · answer #2 · answered by Anonymous · 0⤊ 0⤋
m1u1 + m2u2 = m1v1 + m2v2 where the u's are before collision and the v's are after.
I don't know what you mean by "not completely isolated". If that means some external force is added to the system, then this doesn't hold.
2006-11-25 08:56:04 · answer #3 · answered by sojsail 7 · 0⤊ 0⤋
Law of conservation of linear momentum states that
on a beam of rod(example) the total amount of forces acting in clockwise direction is equal to the total amount of forces acting in anticlockwise direction.
2006-11-25 06:11:59 · answer #4 · answered by So_Hot_An_Ice 2 · 0⤊ 1⤋