Chairboy,
Think about what happens when you land you plane. Even if you grease it in there’s a chirp when the wheels touch and a lateral “bump”. Some of your forward speed gets scrubbed off in an instant to get those non spinning wheels up to speed in an instant. It’s only slight if the plane’s tires/wheel are small and light. If you’ve ever landed in a bush plane with big tundra tires you’d note that the force is pretty significant. Now imagine that the “instant” becomes a constant. At the end of say, ¼ second the wheels go from stopped to 50 mph, at ½ sec = 100 mph, 1 second 200 mph, 10 seconds 2,000 mph… We are talking about a real force here.