Recently I have been takeing the spacial partial inntegration of force formulas to end up with equivelent energy formulas. I have come up with a snag though, static friction. I haven't been able to find a way around the fact that static friction occurs when you're not moving and therefore any spacial integration I do with static friction will in the end just give me a value of 0 J. There has to be a way around this but I need thelp comeing up with that.