Re: Friction

On May 31, 8:28 am, kd <kaustu...@xxxxxxxxx> wrote:
Why is rolling friction much less than sliding friction though we know
that friction is independent of area

It's not. Rolling friction is *larger* than sliding friction. As an
example of that, a car hitting a curve can make the turn successfully
on dry pavement by using rolling friction. However, as soon as the
wheels start to skid (for any reason), sliding friction is not capable
of keeping the car turning, and the car ends up going straight into
the guardrail.

Now, that's probably not what you meant. You probably meant why do we
use wheels rather than skids for cars. And *that's* because the
sliding friction between axles and wheels (at the bearings) is much
less than the sliding friction between skids and pavement.

PD

.