They must have angled the treadmill so that it’s rolling downhill. Effectively it’s like rolling three tapes Racing the greatest show on earth shirt a very long hill. Which one wins? The one with the least rolling resistance (air resistance is negligible here because it’s not an actual hill). Probably thinner means less contact with the treadmill. But the thinnest one also had less mass and was not stable enough to go in a straight lineBy that analogy If one of the tape diameter is bigger it will cover a larger area in one revolution as compared to the smaller one. That may explain the situation, but the distance covered by circumference should be same for both tapes. Something else is at play
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I am honestly brainstorming the same thing. As for when the treadmill the Racing the greatest show on earth shirt with higher mass would go forward because of greater inertia. Similarly one reason why the green tape might be moving forward may be because the treadmill is accelerating and the tape with the higher mass because of its greater mass has a greater tendency to stay at the old speed and hence the inertia acts against it.The only explanation I could come up with is the treadmill is slowing down. It happens to be slowing down at the same speed as the larger roll. The smaller role having less friction outpaces the large roll that is the treadmill belt.Also the mass of the tape may provide a better grip on the treadmill, notice how the smallest one just fell back? A greater traction would mean the speed of treadmill and the tape is pretty similar otherwise the speed of the tape may always lag behind.But the green tape seems to be accelerating whereas the black one stays constant, so its not exactly mass that is the cause. The diameter may have something to do with it. Or the surface area?