Recent content by Serbiwni

So if the motion is to the right, the static friction must be to the left right ? But that's not what the correction says. Who is wrong ?

I drew a free body diagram for the books but it's not the same one in the correction. The static force Fs between the books and the table must be opposite to the motion but the correction does not the same and puts that vector in the same direction as the motion. Here's a drawing of the...