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

Because you need to spin the final gear with the same force to spin the first gear x amount of times, so if its 25k:1, you have to use the same force as spinning thr fast gear 25 thousand times for 1 rotation of the final gear