Dynamics Dungeon: Atwood Machine
weight mgtension T
PREDICT
How this connects to AP Physics 1 (Topic 2.5, Newton's Second Law): write Newton's second law for each mass separately, with the same rope tension on both: m₂g − T = m₂a and T − m₁g = m₁a. Adding them cancels T and gives a = (m₂ − m₁)g/(m₁ + m₂). The tension is always between the two weights. This is the same relationship as the required Newton's second law lab.