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- 1. Mass Weight & Density Done By: Eric Seow
- 2. Mass A measure of the amount of matter or substance in a body Cannot be changed by its location, shape or speed SI unit is kilogram (kg)
- 3. Weight The amount of gravitational force acting on a body Has direction SI unit is newton (N)
- 4. Gravitational Field The region surrounding the Earth where gravity is experienced
- 5. Gravitational Field Strength Defined as the gravitational force acting per unit mass on an object Strength on earth- 10 N kg^-1 Strength on the moon- 1.6 N kg^-1
- 6. Fun fact A person who’s weight is 70kg on Earth would weigh 11.2kg on the moon. This is because the gravitational pull of the moon is much less than that of the Earth’s.
- 7. Inertia Refers to the reluctance of the object to change its state of rest or motion Depends on the mass of the object An object with more mass has greater inertia The larger the mass of an object, the harder it is for it to start moving, slow down, move faster or change direction
- 8. Density Density= mass divided by volume Defined as the mass per unit volume of an object SI unit is kilogram per cubic metre(kg m^-3)
- 9. Density Substances which float on water have a lower density than water Substances which sink in water are more dense than water and have a higher density

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