So, how do you know that the bus you are taking to work is in fact moving? What if you are sitting in the only motionless object in the known universe and everything else, including the road beneath your tires, is moving instead? Well, the truth is that there is no way to prove what is moving and what isn’t. It’s all relative to your frame of reference. To you, the person across the aisle is stationary because your frame of reference is the bus. To the person watching from the sidewalk, however, you are both speeding along at 60 mph (96.5 k/hr) through traffic because their frame of reference is the earth. Let’s take this a step further though as we move on to…