Quote:
Originally Posted by mechman600
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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The corrected statement I provided said under certain circumstances.
So, let's use your example:
Standing on the edge of a cliff at a 45* angle = engaged clutch. No outside factors (wind, rain, rock slides) No Slip. No argument. 1:1.
But, let's add some circumstances that a clutch can face:
Wind gust (wind gust hitting car head on) - Sudden change (rate of torque) - changes the coefficient of friction. The engine has to suddenly add torque to keep the car at the same speed.
Earthquake (driveline vibrations caused by natural frequencies, harmonics, engine shaking, potholes, etc) - vibrations will change the coefficient of friction.
Hot earth? (Just go with this...the flywheel gets hot from repeated use) - changes the coefficient of friction.
Worn hiking shoes (worn clutch disk, pressure plate and flywheel surface) - will affect the overall coefficient of friction and lower the amount of holding power.
Wet ground (Humid? Oil leaking on clutch) - Will surely change the coefficient of friction.
So, under some of these circumstances, would you not agree that a good clutch can slip? By slip, I only mean losing its "1:1" for a moment or two, not slip wildly. All of these circumstances can happen and this is only a list I could come up with in five minutes.