Newton's Second Law of Motion
www.grc.nasa.gov › WWW › k-12May 13, 2021 · His second law defines a force to be equal to the differential change in momentum per unit time as described by the calculus of mathematics, which Newton also developed. The momentum is defined to be the mass of an object m times its velocity v. So the differential equation for force F is: F = d (m * v) / dt