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**1. The problem statement, all variables and given/known data**

I've been trying to attempt this problem for the past day but I don't understand how to answer the questions. It's frustrating. If someone could point me in the right direction that would be nice. My TA did the problem in class but I still don't quite understand it. This is my first time taking a physics course.

A plank with a mass M = 5.60 kg rides on top of two identical, solid, cylindrical rollers that have R = 4.40 cm and m = 2.00 kg. The plank is pulled by a constant horizontal force of magnitude 6.40 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.

(a) Find the initial acceleration of the plank at the moment the rollers are equidistant from the ends of the plank.

magnitude: m/s2

direction:

(b) Find the acceleration of the rollers at this moment.

magnitude: m/s2

direction:

(c) What friction forces are acting at this moment? (Let fp be the frictional force exerted by each roller on the plank, and let fg be the rolling friction exerted by the ground on each roller.)

fp = N

direction:

fg = N

direction:

**2. Relevant equations**

Ʃτ=Fd

v=ωr

a=[itex]\alpha[/itex]r

**3. The attempt at a solution**

Not sure where to start. Any help would be well appreciated.