Here's a diagram below. From my understanding, the apparent weight is the weight that you feel > which is the upward force on you > which is the normal force.
I can clearly see how you'd weigh more in the bottom of the circle, because the net force is directed up, and so that would mean normal force gets increased. Thus saying, you'd feel like you weight more.
From that same reasoning, I'm having trouble seeing why you'd weigh less at the top of the loop, just from looking at the free body diagram.
I have seen physical demonstrations of situations of this with scale readings, and I know you have to weigh less on the top of the loop, but the free body diagram doesn't seem like it shows that, or am I wrong?
What I don't understand is that the length of the normal force vector looks the same as the weight vector. And isn't it true that at the top of the loop, you're upside down so your upward force would be directed down? In that case, this would make your apparent weight equal to your actual weight but that's wrong. Why? I'm having lots of trouble understanding the free body diagram.