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.

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- Jun 5th 2007, 01:44 PMrcmangorolling friction
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. - Jun 6th 2007, 04:12 AMtopsquark
- Jun 6th 2007, 09:07 AMJhevon
- Jun 6th 2007, 09:38 AMtopsquark
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