What happens to force of Friction when Force of Gravity is DOUBLED?

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When the force of gravity is doubled, the force of friction also doubles due to their direct relationship. The force of friction is calculated as the friction coefficient multiplied by the normal force, which is often affected by gravity. If gravity triples, friction will similarly triple, maintaining this proportionality. This relationship continues with any increase in gravity, including quadrupling. Thus, the force of friction consistently correlates with changes in the force of gravity.
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would the force of gravity also double? and what about when the force of gravity triples, then what would happen to the force of friction? Would it be the same down the road, like for example, when it quadruaples, would the force of friction also quadruaples..and have a direct relationship btw. force of gravity and force of friction?
 
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Friction force is the friction coefficient times the normal (perpendicular) force. So if you double the normal force (often resulting from gravity), you double the friction.
 

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