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Hello everyone! I have an idea for my 9th grade physical science class. We just finished a chemistry based PBL and I want to do it again with physics. I want my students to construct a 3-D model or design a roller coaster with their knowledge they obtain during the Forces and Energy portion of the class. I am need of engineers or roller coaster designers for authentic, expert contacts. If you know of anyone who'd be willing, please let me know. Or if you could just get the word out, that'd be awesome too! Thanks!