A string obeys Hooke's law. When pulled with force F at one end and the other end fixed on a wall, the extention of string is x. Then if two forces F are pulled seperately on 2 ends of the string, will the extention be x too? Why?
- 天同Lv 71 十年前最愛解答
Surely, the extnesion is x.
The force at one end of the string keeps the spring in stationary. Withou this force, you would not be able to extend the spring because it (the spring) would move along with the force when it is pulled.
When one end of the spring is fixed on a wall, the force F that keeps the spring stationary is actually given by the wall.