I am not in complete agreement. I considered circular friction force a path as shown in the picture.
The friction force is clearly not conservative, then it is expected that their work is non-zero for the closed path, which is actually true as shown in the calculation. I think that it is a...
Thank you Dale. You could say that the friction force is a vector field, since it is not defined in the entire space ?. For example, in the case of a closed square trajectory, by analyzing the frictional force is being defined with different direction in each of the faces of the square, that...
I understand that, but I want to know how to show this using the curl. Theoretically I should get the curl of the frictional force is nonzero because it not is conservative.
I not understand because why if I have a (constant) force of friction and I apply the curl, I finding that this not is equal to zero, since this force is non conservative.