When being taught about Newton's Second Law, I learned many things. The majority of this is comprised of the acceleration a system experiences when acted upon by an unbalanced force. This is includes the friction that an object experiences when moving (neglecting air resistance, usually). I learned about using my FBDs to calculate the sum of the forces, ∑Fx and ∑Fy, and setting them equal to ma (mass*acceleration). This includes pulley systems and Atwood's machines. I also learned about the coefficient of friction, called mu. This can be obtained from the equation Ff=mu*Fn. Mu is actually a legal naked number because it is obtained by dividing newtons by newtons.
What I have found particularly difficult is solving for the acceleration with very limited information, such as not knowing the mass or weight of the object. I also find it very difficult to find mu in complex situations, such as when the object is accelerating or under certain circumstances and restrictions.
As far as my problem solving skills go, I am satisfied. I feel as though I have mastered FBDs and finding the sum of the forces in one axis. I am good at solving equations for what is needed. I also particularly enjoy the problems relating to Atwood's machines. I am still new to finding mu, which poses difficulties. I also worry when I am given limited information. I always do work to my fullest effort though, so success is soon to follow.