When making a domino run how much larger can the “hit” domino be than the “hitter”? This paper is a fine opportunity to remind yourself of some basic notions of mechanics and to see how others can apply them: van Leeuwen, JMJ (2013) Domino Magnification. The Physics arXiv Blog [ http://arxiv.org/pdf/1301.0615v1.pdf ]. “The Curious Mathematics of Domino Chain Reactions” is a more approachable summary [ http://www.technologyreview.com/view/509641/the-curious-mathematics-of-domino-chain-reactions/?utm_campaign=newsletters&utm_source=newsletter-daily-all&utm_medium=email&utm_content=20130109 ]. An easiest of all.. the Youtube video! [ https://www.youtube.com/watch?v=y97rBdSYbkg ] In the slow-mo notice the bounce – the critical collision elasticity!
Answer: possibly 2.1 but 1.5 is more reliable!