Below are some resources on motivating students that may be useful for some of the inquiry projects
Strategies to Build Intrinsic Motivation
9 Strategies for Motivating Students in Mathematics
Profiles of Intrinsic and Extrinsic Motivations in Elementary School: A Longitudinal Analysis
Corpus, J. H., & Wormington, S. V. (2014). The journal of experimental education: Profiles of intrinsic and extrinsic motivations in elementary school: A longitudinal analysis Heldref Publications, etc.
From Tired to Inspired: Fresh Strategies to Engage Students in Literacy
Schreck, M.K. (2013). From Tired to Inspired: Fresh Strategies to Engage Students in Literacy. Bloomington, IN: Solution Tree Press.
Enhancing Classroom Conversation for All Students
Goldsmith, W. (2013). Enhancing Classroom Conversation for All Students. Phi Delta Kappan, 94(7), 48-52.