please summary the paragraph below for me, thank you! Loss of braking power and
ID: 294666 • Letter: P
Question
please summary the paragraph below for me, thank you!
Loss of braking power and rubber skidding on a wet road is still an open physics problem, as neither the hydrodynamic effects nor the loss of surface adhesion that are sometimes blamed really manage to explain the 20-30% observed loss of low-speed tyre-road friction. Here we report a novel mechanism based on sealing of water-filled substrate pools by the rubber. The sealed-in water effectively smoothens the substrate, thus reducing the viscoelastic dissipation in bulk rubber induced by surface asperities-well established as a major friction contribution. Starting with the measured spectrum of asperities one can calculate the water-smoothened spectrum and from that the predicted friction reduction, which is of the correct magnitude. The theory is directly supported by fresh tyre-asphalt friction data.
Explanation / Answer
Loss of braking power in rubber skidding on a wet road is still a open physics problem. Surface adhesion are sometimes blamed really manage to explain 20-30% observed loss of low speed tyre road friction. The sealed in water effectively smoothenes the substrate. The measured spectrum of asperities one can calculate the water smoothened spectrum. The theory is directly supported by fresh tyre - asphalt friction data.
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