Yes. I understand what friction is conceptually. But, in this you can't determine the direction of the net applied force since there are two forces two forces acting vertically on the book, Fsin(θ) and Mg and the magnitude of F is unknown. I get that if only Mg were acting on the book, the...
The answers show that the static friction between the book and the wall points in the same direction as the vertical component of the applied force. That is, Fsin(θ) + ForceFriction -Mg=0. But why does the friction point in the same direction as the vertical component of F? More generally, if...
Yeah I mostly get it now. One last thing: So, for this problem, its best to determine the directions of R and F1 by looking at the torques about the point of contact at the ground and then find the direction of F by looking at the torques about the center of mass. Is this correct?
Yes, but you can also look at the torques about the center of mass of the cylinder. In which case, F needs to point leftward to counter the torque of F1. Right?
Then what's the reason?? I understand why F1 and R point in their respective directions but why does F have to point left? R doesn't create a torque right? So, F has to counter the torque created by F1 and point left. Is this thinking correct?
So, I don't understand which way the friction between the cylinder and floor F should point. Can you explain how you would draw the free body diagram if you saw this problem? Thank you
Ok, so drawing the free body diagram of the cylinder means that I should draw R going into the cylinder (as it appears in the answer) since that's the normal force acting on the cylinder. Then, since the normal force R pushes into the cylinder (its x component pushes to the right), the...
I have put a picture of the problem above. The picture below shows my free body diagram. Fg is the component of the gravitational force in the direction fo the tangent at the point of contact and Ff is the frictional force between the plank and cylinder. I put Ff in the opposite direction as Fg...