Guillaume Amontons
（重定向自Amontons）
![](/Images/godic/202412/20/Guillaume_Amontons3924.png")
![Free-body diagram for a block on a ramp. Arrows are vectors indicating directions and magnitudes of forces. N is the normal force, mg is the force of gravity, and Ff is the force of friction.](/Images/godic/202412/20/Free_body_diagram2.svg3924.png")
Guillaume Amontons (31 August 1663 – 11 October 1705) was a French scientific instrument inventor and physicist. He was one of the pioneers in studying the problem of friction, that is the resistance to motion where bodies are in contact. It is nowadays known as tribology.