Answer:

  The tendency of an item to resist altering its state of motion, known as inertia, is measured by mass. The amount of matter – atoms and other particles – in an item determines its mass; more mass indicates more inertia, as there is more to move. Weight, on the other hand, is a measurement of the downward force exerted on an object by gravity. The gravitational force increases with the mass of the object: the more inertia it has, the stronger gravity pulls.