A plank with a mass
M=6.00 kg rests on top of two identical, solid, cylindrical rollers that have
R=5.00 cm and
m=2.00 kg. The plank is pulled by a constant force
→F of magnitude
6.00 N applied to the end of the plank and perpendicular to the axes of the cylinders ( which are parallel). The cylinders roll without slipping on a flat surface. There is also no slipping between the cylinders and the plank.
What friction forces are acting at this moment?