I just read the book understanding gravity and I tried to do the math problems in them newtons law of gravity f=ma and I got completely lost. I didn't understand what he meant by an object at rest exerts the same amount of force as an object falling. I didn't understand the math about it. I guess I'm just not cut out for this, and I should just learn my place. I want to be a physicists but I guess I'm just going to have to be satisfied being a struggling single mom, with no passion.