This creates an air cushion that causes the raindrop to flatten and spread out, which the team believe would be less likely if the drop was striking
a higher friction surface, and may help the splash evolve into a crown (Physical Review Letters, vol 102, p 134502).
Note that all handling behaviors described herein are applicable in «close to the limit» situations which is to say close to the limit of grip and are mainly valid on
high friction surfaces i.e. dry tarmac.
There are several reasons why rear drive is better on
a high friction surface but mostly it has to do with trying to both steer and drive with the same tires.
Not exact matches
If the
surfaces were polished to be flatter so that twice as much area was in contact, the
friction would then be twice as
high.
In a paper published in EPJ E, the authors found that under the same solid fraction,
friction on
surfaces with a structure made up of micro-holes is much
higher than that on
surfaces patterned with an array of pillars.
Friction only arises at the locations where the
highest hilltops on the two sliding
surfaces touch one another.
But this assumes a
high degree of
friction between the lower atmosphere and a craggy, rocky
surface and efficient
high - altitude air flow.
«At those altitudes, there is no planetary boundary - layer
friction with the
surface (meaning, the
surface terrain does not exert a frictional drag on the wind moving above it), so
high - speed winds might be possible.
When performing a very strong braking from medium - to -
high speed on good
surface, chances are that the limiting factor is not the ABS system nor the
friction with the tarmac, but braking power.
The rear rotors consist of an aluminum «hat» connecting the rotor to the hub and a
high - carbon cast - iron outer section as the
friction surface; the two portions are riveted together.
Other
high - tech features include variable camshaft adjustment, four - valve technology with bucket - type tappets, a particularly rigid aluminum crankcase of closed - deck design and the low -
friction TWAS coating on the cylinder contact
surfaces.
Built almost completely from a
high - strength silicon - aluminum alloy, the cylinder bores make use of a twin - wire - arc - sprayed (TWAS) coating, a process that results in impressively low
friction and running
surfaces that are twice as hard as conventional cast - iron cylinders.
The clutch located on the PTU has two functions: axial disk
surfaces with a
high friction coefficient are used to absorb synchronization energy; while a self - energizing, bi-directional wedge clutch supports
high drive train torques.
One instance where a heavy vehicle's yaw stability threshold might be
higher than its roll stability threshold is in an unloaded condition on a low -
friction road
surface.
The colder the pole, the stronger the
high, and the faster the northward motion of the air, and the sooner it can get north before picking up angular momentum from the
friction against earth's
surface.
For example, the root system of forest trees facilitates both storage and extraction of moisture from soil; biogenic aerosols produced by trees control the intensity of water vapor condensation over the forest; the large height of trees determines the vertical temperature gradient under the canopy, keeping soil evaporation under biotic control; tall trees are also essential for
surface friction that does not allow extremely
high wind velocities to develop.
Surface friction is
higher when compared with some competing touchpads, a trait we like because it provides a more tactile experience.
So, if you typically put your iPhone on armrests, sofas, or other non-flat
surfaces, stop doing that or get a case with a
higher coefficient of
friction.