where a c {\displaystyle a_{c}} is the centripetal acceleration. The direction of the force is toward the center of the circle in which the object is moving, or the osculating circle (the circle that best fits the local path of the object, if the path is not circular).
The assassination of Archduke Franz Ferdinand of Austria, heir presumptive to the Austro-Hungarian throne, and his wife Sophie, Duchess of Hohenberg, occurred on 28 June 1914 in Sarajevo when they were shot dead by Gavrilo Princip.
On June 28th, 1914, while riding in the motorcade through the streets of Sarajevo, Franz Ferdinand and his wife Sophie were shot and killed by Gavrilo Princip -- one of seven young Bosnians and Black Hand recruits. The assassination provided 'justification' for Austria to take hard action against Serbia.