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1. Textbook explanation : Mass is the measure of the amount of matter or substance in a body. The amount of mass a body has depends on the number and composition of atoms and molecules that make up the body.
2. On earth, Gravitation field strength about 10N/kg. Means a 1kg mass will experience a gravitational pull of 10N
3. Scientific explanation : Mass is the quantity of inertia possessed by an object or the proportion between force and acceleration referred to in Newton's Second Law of Motion. cr: physics.about.com/od/glossary/g/mass.htm
4. Gravitation pull is not gravitation field strength
5. Units/Notations
5.1. NKg^-1
6. Mass
6.1. units: kg, tonne
7. Weight
7.1. It is the force that is a result of the gravitational pull exerted by the Earth. (Gravity)
7.2. It is a force and has direction.
7.2.1. Its direction is downwards - towards the center of the Earth.
7.2.1.1. gravity
7.2.1.2. Vector quantity
7.3. As we learnt before, weight = mg.
7.4. SI unit: newton
7.4.1. 10N=1kg x 10N/kg
7.5. Weight is directly proportional to the mass of the body.
7.6. Gravitational Pull increases when the mass increase.
8. Gravitational Field Strength
8.1. Definition
8.1.1. Refers to the size of gravitational pull acting on per unit mass
8.2. Relation to other quantities
8.2.1. Weight over mass and the acceleration due to gravity