Sir Isaac Newton revolutionized the way that we look at motion, and he did it with three simple laws:

1. An object at rest will remain at rest and an object in motion will remain in constant straight-line motion unless acted upon by an unbalanced outside force.
2. An unbalanced force causes an acceleration described by the equation F_net = ma.
3. For every pair of objects, if object A exerts a force on object B, then object B will exert an equal and opposite force on object A. (F_AB = -F_BA)

John is sitting in physics class, and is trying to impress Tina with the powers of his mind. He claims that he can place a marble on the physics counter that he is sitting at, and make the marble move simply by staring at it and concentrating on the word "move". When he tries this for 5 minutes, the teacher gets his attention and encourages him to get back to the lesson plan. Unfortunately, the marble hasn't budged, and Tina is now laughing at him!

The next day in class, Tina tells John that she will give him a break, and let him try something that should be easier. She knows that the top of the physics counter that she is sitting at is level, so she tells John that she will roll the marble slowly across the counter, and all he has to do is concentrate on the marble and make it change direction or speed as it is rolling, solely by using the power of his mind. When he tries again, John notices that the marble keeps rolling in a straight line as long as it is on the counter top.

Because John is once again distracted, the teacher gives him detention. When serving detention, John tells the teacher what he was trying to do, and the teacher directs him to the chapter on forces for homework.

What do you think that John learned about Newton's first law from his physics book?