Here we propose that the effects of social movements increase as they gain momentum. We approximate a simple law drawn from physics: momentum equals mass times velocity (p = mv). We propose that the momentum of dissent is a product of participation (mass) and the number of protest events in a week (velocity). We test this simple physical proposition against panel data on the potential effects of movement momentum on irregular leader exit in African countries between 1990 and 2014, using a variety of estimation techniques. Our findings show that social movements potentially compensate for relatively modest popular support by concentrating their activities in time, thus increasing their disruptive capacity. Notably, these findings also provide a straightforward way for dissidents to easily quantify their coercive potential by assessing their participation rates and increased concentration of their activities over time.
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. 8/5/2019. “The Physics of Dissent and the Effects of Movement Momentum.” Nature Human Behaviour. See full text.Abstract
. 9/25/2019. Civil Action and the Dynamics of Violence, Pp. 320. Oxford University Press. See full text.Abstract
. 5/13/2019. “The '3.5% rule': How a small minority can change the world.” BBC Future. Publisher's VersionAbstract
. 10/23/2019. “The Science of contemporary Street Protest: New efforts in the United States.” Science Advances 5 (10). See full text.Abstract
. 6/25/2019. “Reclaiming Stonewall: Welcome to the Celebration—and the Struggle.” The Nation.Abstract
. 4/20/2020. “Questions, Answers, and Some Cautionary Updates Regarding the 3.5% Rule.” Carr Center Discussion Paper Series, 2020-005. See full text.Abstract
. 4/20/2020. “The Global Pandemic Has Spawned New Forms of Activism – and They’re Flourishing.” The Guardian. See full text.Abstract
. 5/10/2020. “Media Coverage Has Blown Anti-Lockdown Protests out of Proportion.” Vox. See full text.Abstract
. 6/6/2020. “The Floyd Protests Are the Broadest in U.S. History — and Are Spreading to White, Small-Town America.” Washington Post. See full version.Abstract
. 7/2020. “The Future of Nonviolent Resistance.” Journal of Democracy , 31, 3, Pp. 69-84. See full text.









