Right - I would say I have quite a good knowledge of physics - arguably a big factor into why cycling is my sport of choice. But this is something I can't comprehend.
But I recently read an article on Velodromeshop.net that claims:
If I'm correct, 47x14 and 50x15 are incredibly close in gear ratio (if not the same?).50x15 would suit Time Trial/Pursuit riders more due to the larger chainring, that is slower to accelerate but easier to maintain your average cadence (pedalling rpm), whereas your cadence will be obtained quicker with the smaller 47x14 chainring setup as the smaller chainring enables a much quicker acceleration hence this technique is better for short distance/sprinters.
So - if you pedal either of these gears at 100RPM, you will be traveling at the same speed (I haven't worked the actual speed out), but acceleration differs between the gearing (atleast according to the article).
I only have one question: How?
(The article can be found at: http://www.velodromeshop.net/index.p...e_id=gearevent)