Reaction R in lift problem?
In one of the physics book I read the following article on variation of weight in lift.I request uyou also please see it & answer my query.
It was written that
"In a lift the actual weight of the person=mg.This acts on the weighing machine which offers a reaction R given by the weighing machine & this is the apparent weight of the person".
After this the variation of R was given in different case.Here I want to ask that as R is the reaction force given by machine in response to actual weight of the person=mg,so it must be same but how it can be different.I was not able to understand mathematically so can anyone please explain it to me logically.
thank you