Mass is a measure of how much __________ (stuff) an object is made up of. It is measured in Kilograms (kg).

Weight is the __________ directed to the __________ of the Earth, experienced by objects of mass, due to the attraction of gravity.

As with all other forces Weight is measured in __________ (__________). It is proportional to the mass of the object and the strength of gravity between them.

	W = m g
where: W = Weight in __________, __________ m = mass in __________, __________ g = Gravitational Field Strength in __________, __________

Although the symbol for weight is 'W', it is more common to use 'mg' in diagrams and calculations.

Close to the Earth's __________, the gravitational field strengh is approximately 10 Newtons per Kilograms (N/kg).

Examples

An average apple has a weight of 1 __________. Therefore it has a mass of __________ kg.

An object with a mass of 50 kg has a weight of __________ __________.

On the Moon's surface the gravitational field strength is approximately 1.6 N/kg. The weight of the same 50 kg object on the moon, is only __________ __________.