The four forces of flight include drag, thrust, lift, and weight, and they greatly affect an airplane. Drag is the force that opposes the forward movement of an airplane, while thrust is the force that pushes an airplane in the forward direction.
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PRIORITIES OF SURVIVAL – PROTECTION, LOCATION, WATER, FOOD.Whilst being listed in order of priorities, common sense and flexibility must be utilised in changing this order. But for most situations, this sequence works.