THe coefficient of rolling friction is 0.02, then what force is needed to keep a 5 kg ball rolling at a constant speed on a horizontal surface
i know to use gravity, 9.8 m/s^2
please help me with this one.
thankyou.
Sorry! I guess I wrote that for only the original poster, didn't I?
$\displaystyle f_r = \mu _r N$
where
$\displaystyle f_r$ is the force of friction
$\displaystyle \mu _r$ is the coefficient of rolling friction (typically much less than the coefficient of kinetic friction.)
and
N is the normal force on the object between the pair of surfaces inducing the friction.
-Dan