Answer to Question #21570 in Electricity and Magnetism for shakti

Question

SIR CAN U PLEASE TELL ME-
why WEIGHT IS EQUAL TO MASS X ACCELERATION DUE TO GRAVITY(F=MG)???? BECAUSE WHEN WE PUT ANY OBJECT ON WEIGHT MACHINE THEN NO VELOCITY OF THE BODY IS CHANGING. AND HENCE NO ACCELERATION .SO IN THE FORMULA F=MG,THE VALUE OF G SHOULD BE ZERO EVERY TIME?? PLZ.....SOLVE MY QUESTION..YOUR HELP WILL BE VERY HELPFUL TO ME........