# Day 9: Rules for the Direction of the Unbalanced Force

The set of problems today asked students to draw multiple representations based on given velocity-time graphs, but also to say whether the forces were balanced, unbalanced in the positive direction, or unbalanced in the negative direction. After the first problem, one student volunteered a rule (I didn’t prompt this!)—that the unbalanced forces were correlated with the acceleration. That 0 acceleration means balanced forces, positive acceleration means positive unbalanced forces, … Continue reading Day 9: Rules for the Direction of the Unbalanced Force