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Thanks for replying. I’m trying to work out the energy impact of using normal inner tubes vs. light weight inner tubes (combined weight difference of 50g) on, e.g., Campenaerts’ hour record of 55km. It’s for illustrative purposes rather than a formal inquiry, so don’t need to overly complicate it.
Edit- what I’ve done so far:
W=F*d
W=(m*a)d . I’m not sure how to work out or around the acceleration.
W=[m(v-v0/t)]d
W=[.05kg(15.28m/s-0m/s /3600s)55000m
W=[.05kg(.004244m/s^2)]55000m
W=.000212N*55000m
W=11.66J
...?
Adhiero-
For that case, the mass is all but irrelevant, but the thinner walled tubes will have smaller hysteresis loss if made from the same material. That effect will massively overdominate any effect from the difference in mass.
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Depends on your path round the velodrome, doesn't it? If you're managing a steady speed round the track and not going up and down the banking, the only difference is going to be in the initial work of accelerating up to speed.
I would have thought that on a track it was the reduced rolling resistance of lightweight tubes that made the greater difference (and wouldn't they have used tubs?). Rolling resistance is also a function of load on the tyre, but a 50g difference is going to be an infinitesimal effect at track pressures.
(Edit - beaten to it by Tester)
gbj_tester
Thrustvector
55 km horizontally in a vacuum? Zero work done.
55 km horizontally in not a vacuum? You need to know wind resistance of your object, and the speed it moves, and so on.