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Mechanics In the dynamics and kinematics fields of mechanics, Ibn al-Haytham's Risala fi’l-makan (Treatise on Place) discussed theories on the motion of a body. He maintained that a body moves perpetually unless an external force stops it or changes its direction of motion.[24] This was a precursor to the law of inertia later stated by Galileo Galilei in the 16th century and now known as Newton's first law of motion.[22] Ibn al-Haytham also discovered the concept of momentum, part of Newton's second law of motion, around the same time as his contemporary, Avicenna.[23]