The lower piece of silk in Figure 3.20 is acted on by two forces, +T2 at the upper end a...

The lower piece of silk in Figure 3.20 is acted on by two forces, +T2 at the upper end and -T2 at the lower end. These two forces are equal in magnitude and opposite in direction. Are they an action–reaction force pair? Explain why or why not. (reference figure3.20)