Originally Posted by
gregf83
If your bike weighs over one ton weight matters. If you’re talking about adding a few pounds then, no, it doesn’t matter. Yes, it might take an extra Watt of power but it won’t make any difference to your enjoyment of riding.
Not sure if people don’t understand physics or just have no common sense...
What's even funnier about the box car example is that if the track is on flat ground, a box car pushed to 15 mph then released by the locomotive is actually going to roll by itself for quite some distance. Steel wheels on straight steel rails is a very low resistance road, and the momentum carries for quite a ways. If you ever see them hook up trains at a freight yard, they use this effect all the time.