The phenomenon of inertial mass is defined in Newton's First Law: "Objects move in straight lines at constant speed unless pushed on" but it has never been explained. Quantised inertia explains inertial mass, for the first time, by combining two predictions: | The phenomenon of inertial mass is defined in Newton's First Law: "Objects move in straight lines at constant speed unless pushed on" but it has never been explained. Quantised inertia explains inertial mass, for the first time, by combining two predictions: |