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The speed is not a factor but the acceleration of the person is. The equations are m= mass of the person $ \mu=friction\ index$ $\alpha= acceleration$ g=9.8ms^2 $\theta= angle\ of\ the\ ramp$ $$F_{net}=mgsin \theta-\mu mcos\theta=ma $$ Dividing both sides by m we get $$a= g sin\theta-\mu cos\theta$$ This is the acceleration downslope if the person is ...


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I think it's the effect of "tightening the screw", a lot of friction distributed over a large area. Even if the plate doesn't bend, it will still accumulate a bunch of tension, and as a result, friction. You need to stop the motor before that happens. I think a mechanical stop could work: put a small "blade" of sheet metal on the shaft (...


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