IIT JEE , AIEEE Forum - Physics , Mechanics - When to apply conservation of angular or linear momentum in solving problems?

iwannacrack_iit

Actually i don't know when to apply the conservation of momentum
like
M1V1=M2V2

etc.......

i really face problem in solving sums whose answer depend of conservation..........

kindly ..........give me some useful contributions......to solve this

karthik2007

u will get it by practise only.... give some problems and i'll try to illustrate

srujana

It is mostly useful when you are dealing with sums related to collisions

In that case
when no external force is acting on a system

the total momentum of the two objects before the collision is equal to the total momentum of the two objects after the collision. That is, the momentum lost by first object is equal to the momentum gained by the second object.

or in general if F ext=0, initial momentum of a system=final momentum of the system.

1 more advantage of momentum conservation is that.....it can be done even when the collision is elastic or inelastic....

papu071291

conservation of momentum is only applicable when there is no net ext force acting on the system

iwannacrack_iit

thank you every one..........
now i understood that this concept is applicable only when ext.force is absent

so in the case of rolling ..............is it that we can conserve momentum only when ext.torque is absent

THANK YOU

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