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If you stand near the edge of a cliff where the ground is slanted 45 degrees, only friction is keeping you from sliding and falling off. I am quite sure that under most circumstances, you could stand near the edge for hours without sliding off. Maybe even days if you didn't fall asleep and fall over. Therefore, it can be said that your feet have a 1:1 ratio with the ground, even though it is only friction keeping them from moving. If not, you would fall off the cliff.
Same thing as an engaged clutch.
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