Today while I was riding in the car with my dad, I was drinking from a bottle of powerade, such as the one pictured above. (except mine was actually red) We all know how difficult it is to drink from a bottle or a can in the car, and today was no exception. I took a nice long sip, but suddenly my dad accelerated, and the red liquid spilled all down my shirt. Fortunately I was not wearing a white shirt. I glanced at my dad and saw him laughing at me, but this time, my messyness had nothing to do with the accident. This time, I could point the accusatory finger of blame at physics. Newton's laws provide an explanation for why the powerade spilled. In fact, this incident is a lot like the pendulum-in-the-car problem we had on a quiz oh so long ago. The powerade spilled out of the bottle for the same reason I was pushed back into my seat when the car accelerated. Both me and the powerade resisted the change in motion. Prior to the acceleration, there was no net force acting on me or the powerade because we were moving at a constant velocity. However, once my dad accelerated, there was a net force because F=ma.