1. The problem statement, all variables and given/known data if the equilibrium rule states ƩF=0N, how can something move or be moving at a constant speed ? eg I push on a box with 50N and friction provides 50N back, resulting in ƩF=0N. So I am not providing more N than the box is resisting with. I thought something could only be moved if the moving force was greater than the resisting force ? otherwise wouldn't it be a stand still ? 2. Relevant equations 3. The attempt at a solution ****update***** just had thought...I'd only need more force than the friction provided to get the box moving, but once moving and if at a constant speed then its motion is unchanged, thus the zero net force ?? And this then becomes the first law as now it is moving it will remain moving until an unbalanced force acts upon it ??