2
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 ...
1
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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