Apparent weight The weight is read by a scale It is given by the magnitude of the normal force W′=|N|=N N >)The block pushes on the scale with a mg force equal but opposite to N(action reaction) The normal is found from the net force net=N+mg= ma If platform (and object+scale)is not accelerated Net force is zero N=-mg =,W=mg Physics 121: Lecture 5, Pg 6Physics 121: Lecture 5, Pg 6 Apparent weight The weight is read by a scale It is given by the magnitude of the normal force »The block pushes on the scale with a force equal but opposite to N (action￾reaction) If platform (and object+scale) is not accelerated Net force is zero N mg -N The normal is found from the net force a