A measure of a body’s inertia (i.e., its resistance to acceleration) and termed inertial mass. According to Newton’s law of universal gravitation, mass can also be defined in terms of the gravitational force it produces, and which is called gravitational mass. The latter is used to measure weight and in defining the kilogram, the SI unit of mass.
See Center of mass, Dynamics, Force, Gravitational field, Inertia, Kinematics, Matter, Moment of inertia (I), Momentum, Newtonian (or classical) mechanics, Newton’s law of universal gravitation, SI unit