The mass of an object tells us how much stuff there is there. The mass stays the same wherever you are. The constant velocity of a falling object on which the forces are balanced. The pull of gravity on an object. The Earth pulls with a force of about 10 newtons on every kilogram of mass.
Weight is measured in newtons.
Wise-up Useful facts to use when explaining why a falling object may reach terminal velocity. Terminal velocity occurs when the weight of an object is balanced by the drag. Drag depends on the speed of an object - the faster it moves the greater the drag. Drag depends on the shape of an object. A streamlined object like a fish or a Grand Prix car has a low terminal velocity, compared to a turtle or a large lorry.