関連ワード:  mass is a scalar or vector quantity    is mass a scalar or vector quantity state its si unit    energy is a scalar or vector quantity    mass density is a scalar or vector quantity    is energy a scalar or vector quantity explain    centre of mass is a scalar or vector quantity    mass and weight is a scalar or vector quantity    kinetic energy is a scalar or vector quantity    potential energy is a scalar or vector quantity    surface energy is a scalar or vector quantity