- #1
Clara Chung
- 304
- 14
In the picture about, I gave 1. a picture of a segment of string for reference, 2. a description of the driving force and 3. a description about the potential energy per unit length of a point in the wave.
I have two questions here.
1. Why does the driving mechanism produce a force to balance the transverse component of the tension in the string at x=0? Intuitively, shouldn't the driving mechanism produces the transverse component of the tension to initiate and support the wave motion?
2. Isn't the force against the tension -T? Therefore, why isn't the work done against the tension per unit length U= -1/2 T (∂Ψ/∂x)^2 ?
I am having a difficult time on figuring out what are the signs. Thank you so much for your help.