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A couple of forces act on the screw and create the turning effect. But after sometime it gets harder. So, net torque is decreasing, but why is it decreasing? Frictional force comes into action, but friction doesn't depend on surface area. So, frictional force will remain constant.
So what decreases the net torque of the screw that makes it harder to rotate with time?
So what decreases the net torque of the screw that makes it harder to rotate with time?