1. The problem statement, all variables and given/known data Well i have a lab practical due for physics and im having trouble with it. we have to assemble a tri level mobile. that wasn't that hard. the difficult part is doing the math to support my answers. i need to use translational and rotational equilibrium. i looked through my books but i couldnt find anything past a single help problem that doesnt apply to me and a brief explanation 2. Relevant equations i dont have any equations because i have no idea how to set it up. can anyone walk me through a practice problem? i would really appreciate it. 3. The attempt at a solution sorry. i understand that it needs to equal out so the net force equals zero so that it is in balance (equilibrium) im just not sure how to back it up with my numbers.