Today I witnessed something that I have never really thought about before. As I passed by the gate to the parking garage of the hospital, I realized that the gate had a lot to do with physics. First off, the gate's velocity remains constant while going up and coming down. The only time the velocity is zero is when it reaches the top, and stays there until the car passes underneath. Gravity's acceleration really has no effect on the gate as it is electrically powered. Also, the displacement of the gate remains the same from the beginning of the day, to the end because it always returns to its final resting position. I never thought something so simple could have physics involved.