Its been a while since we have talked about relative motion, so lets take it back a few steps! The most important thing to remember when dealing with motion is that it is always relative. Now you probably recall the upcoming question... "RELATIVE TO WHAT!" That's where things can go in all different directions!
For example, my two friends at the volleyball banquet tonight were walking together towards the food line. I snapped this first picture of them (lets just say they're walking at 5 m/s... that seems really unrealistic but I'm telling you, they were hungry!) They were able to carry a conversation because relative to each other, they were moving at 0 m/s. My friend in the blue dress started walking 3 m/s faster (8 m/s) to get to the line faster. To the girl in the blue dress, it seems as though the other is moving backwards (negative) when really she, herself, was just walking faster. Then, the same girl in the blue forgot her ticket! Oh no! She quickly turns around and walks quickly to her table at 5 m/s passing her friend (who is walking at the same speed). When they pass each other, it seems as though they are moving faster because all they can the blue girl can say is "WAIT FOR ME". She could only fit in 3 words because relative to her friend, she was moving at double the speed (10 m/s). When moving in opposite directions at the same speed, an object's speed seems to double!
Much more to learn in physics!!
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