Recent content by ElectroMaster88

I think I understood: Because the tension of the string is 20N, to make the net external force on box A 0 (which will make static friction of 0), I need to apply 20N of force in the opposite direction, which is F. So that's why the answer is 20N. And because μN is the maximum possible force of...

I don't understand how to solve these, and I don't understand how an horizontal force can affect the friction force if it's defined by μ*N, and the additional force affect neither of those. I also don't understand how there is a range of possible forces that F can be to make the system static...

I do not mean neutral electrical charge, but a forth kind (if exists) I am in 9th grade, and someone asked the teacher if there is an electrical charge that is not positive, not negative and not neutral, maybe something in the middle of them. The teacher said that there is a charge like that...