## Explanation wanted for a demonstration in MIT phyiscs lec #6

 According to (Force)*(Time) = (Impulse), if 50 Newton is exerted on the 2kg mass through a string in 0.5 seconds, then the hanging mass's change of momentum would be 25kgm/s.
We can't say that. You're missing the other forces in the picture. If a body is subjected to a constant net force of F newton for t seconds, its change in momentum will be, magnitude of F multiplied by t, yes. Here the 50 N isn't the net force.

 .....if in an experiment one pulls on the string with 50N tension and the string takes 0.5 seconds to completely transfer that force to the 2kg hanging mass...
Force isn't a substance to be transferred. It is applied.
And regarding the situation you mentioned where the string breaks, if the string had indeed maintained a constant force of 50 N for the time 0.5 s on the body under the influence of no other forces before breaking, then yes. the body should have a change in momentum of 25 Kgm/s.

 Quote by sganesh88 Force isn't a substance to be transferred. It is applied.
I may have used the wrong diction, pardon me for that, but in that context I meant force as being "propagated".

Though thank you for your clarification on the subject of impulse.