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14.2 Definitions, Terminology, Units and Abbreviations
14.2.2 State the International System (SI) and ICAO units used to express:
(a) distance;
metre (m)
(b) time;
second (s)
(c) velocity;
nautical miles/hour (kts)
(d) mass;
kilogram (kg)
(e) volume;
cubic metre (m³)
(f) temperature;
degrees Celsius (ºC)
(g) altitude.
feet (ft)
14.2.4 Define and where appropriate show the relevant relationships between:
(a) mass, weight and gravitational force (g);
Mass (m)
- the amount of matter in an object.
- 1kg of mass on the earth is the same as 1kg of mass on the moon.
Weight
- the force produced by gravitational attraction between masses.
- Weight = mass x gravity
- the 1kg of mass is heavier on the earth than on the moon.
Gravitational Force
- a force acting towards the centre of an object.
- the bigger the object, the bigger the force.
(b) inertia;
- 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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