ELI5; When you have an absurd gear reduction, why is it harder to turn the final gear?

Question

I honestly don’t get this. I see these absurd gear reduction videos, 25k:1, Googol:1, etc. The first gear is easy to turn but the last barely turns due to gear reduction. They always show themselves trying to turn the last gear by hand and it doesn’t turn easilly. Why is that the case? why can’t the last gear become the first if you turn it first?

In: Engineering

Answer 1

Gears exchange torque for speed.

3:1

1 speed and 3 torque –> 3 speed 1 torque

The rest can be extrapolated from this.