Some real life examples of mass-spring systems in real life that i found are; a baby bouncer, pogo stick, and mattress. The most interesting one to me that I feel relates most and is easy to see is the baby bouncer. I have a younger brother that is about fifteen years younger than I am and I can remember him using the baby bouncer. Then I obviously would have never related that to trigonometry but now I do think it is interesting knowing how it works. The amplitude would matter I would assume on how much force or weight the spring would hold. The bigger the amplitude, I would assume the bigger the spring results in greater force. The period would affect the range that the spring/bounce would get, how high the spring stretches. The frequency would affect how fast/how many bounces a baby could get. Doing the mass-spring project changed the way I think about trigonometry in real life. Only because now I see it in more places. I am definitely not the kind of person to go around looking at how things work- why I do not major in physics- but it is good to be knowledgeable of these things and this project opened my eyes to that much.