Friction

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The friction property acts to simulate 'real' friction by reducing the velocity by a specified % per second.

It can be used to simulate things rolling to a stop.

It is different to acceleration, as it works by modifying velocity by a percent instead of a fixed value.

Example
An object has _vX = 100, _fX = 10:

·	after 1 second, _vX = 90 (100 - 10%)

·	after 2 seconds, _vX = 81 (90 - 10%)

·	after 3 seconds, _vX = 72.9 (81 - 10%).