gravitational
The terms mass and weight, while often used interchangeably, are technically different terms. Mass is the quantity of inertia possessed by an object. Weight refers to the gravitational force acting on a mass, as measured on a scale. On the surface of the earth, the numerical values of mass and the corresponding force of gravity weight are approximately equivalent. For now, we will use the terms mass and weight interchangeably although mass is the more appropriate scientific term.