The correct answer is Newton's 1st law of motion. The branch of a tree is shaken violently; the leaves fall due to Newton's 1st law of motion.Due to the phenomenon of the law of inertia, the leaves try to be at rest when a tree is shaken, but the branch and trunk are in motion which causes the leaves to fall from its branch.Newton's 1st law of motion states that a body is at rest; it will remain at rest unless it is acted upon by some external forces.Important Points Newtons 2nd law states that the acceleration of an object as produced by a net force is directly proportional to the magnitude of the net force, in the same direction as the net force, and inversely proportional to the mass of the object.The Newtons 3rd law states that for every action there is an equal and opposite reaction.Additional Information The joules first law shows the relationship between heat produced by flowing electric current through a conductor. \(????Q = I^2 R T\)Joule's second law states that the internal energy of an ideal gas is independent of its volume and pressure, depending only on its temperature.