Read each textbook selection below. Then complete the study notes by circling the letter of the answer that best summarizes an example of the term being defined. Imagine a ball lying on a level table. Left alone, the ball stays where it is. Given a gentle push, the ball rolls a short way and then comes to a stop. The smoother the ball and the tabletop, the farther the ball rolls before stopping. Suppose that we have a perfectly round ball and a perfectly smooth and level tabletop, and that no air is present to slow down the ball. If the table is infinitely long and we give the ball a push, will it ever stop rolling? In fact, we can reasonably expect that under ideal conditions the ball .would keep rolling forever. This conclusion was first reached by Galileo and later stated by Newton as the first law of motion: An object will continue in its state of rest or of motion in a straight line at constant speed if the object does not interact with anything else. Study notes: Newton's first law of motion—an object will continue in its state of jest or of motion in a straight line at constant speed if the object does not interact with anything else. Example—