Do objects of different masses really fall at the same rate? The Nordtvedt effect posits they don'tEsther Inglis-Arkell2/03/13 11:00am72EditInvite manuallyPromoteDismissUndismissHideGo to permalinkIt's been demonstrated since the 1500s that, when falling toward a certain body, objects fall at the same rate. Everyone from Galileo in Pisa to David Scott on the moon demonstrated that. But what if they're wrong? The Nordtvedt effect posits exactly that.