I have trouble determining the system of forces in systems with strings like the following:
The Attempt at a Solution
My guess is it is:
mass 1: -kx1+k(x2-x1)=m1a1
mass 2: -k(x2-x1)+kx1=m2a2
I'm not sure it is correct. Even if it is, anyone knows a good way to see the correct signs of the forces? I have some trouble identifying them...