I was a reading a little section in my physics textbook regarding tension in a flexible cord. There is a part in the paragraph that I am not sure why is true. It goes as follows: "When a flexible cord pulls on an object, the cord is said to be under tension, and the force it exerts on an object...[can be the tension]...FT. If the cord has negligible mass, the force exerted at one end is transmitted and undiminished to each adjacent piece of cord along the entire length to the other end." Could someone explain to me why the second sentence is true? Thank you.