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12.2 Definitions, Terminology, Units and Abbreviations
12.2.2 State the International System (SI) and ICAO units used to express:
- metre (m)
- second (s)
- metres/second (m/s)
- nautical miles/hour (kts)
- kilogram (kg)
- cubic metre (m³)
- kelvin (K)
- The degree Celsius (ºC), a derived SI unit, is far more common.
- feet (ft)
12.2.4 Define and where appropriate show the relevant relationships between:
(a) mass, weight and gravitational force (g);
- the amount of matter in an object.
- 1kg of mass on the earth is the same as 1kg of mass on the moon.
- the force produced by gravitational attraction between masses.
- Weight = mass x gravity (W = mg)
- the 1kg of mass is heavier on the earth than on the moon.
Gravitational Force (g)
- a force acting towards the centre of an object.
- the bigger the object, the bigger the force.
- A property of matter by which it continues in its existing state of rest or uniform motion in a straight line.
- More mass = more inertia.
- Newton's first law states that every object will remain at rest or in uniform motion in a straight line unless compelled to change its state by the action of an external force.
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