Atwood Machine
Interactive simulation — adjust parameters and watch the visualization update in real time.
Live graphs
How it works
Two masses connected by a light string over a smooth pulley behave as a single system. If m₁ > m₂, the heavier side accelerates downward; the string tension is the same on both sides and is less than the weight of either mass alone when both are hanging.
Key equations
a = g (m₁ − m₂) / (m₁ + m₂)
T = 2 m₁ m₂ g / (m₁ + m₂)