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Energy Track
Send a ball over hills and through a loop while KE and PE trade off before your eyes.
About this simulation
Drop a ball on a curved track with hills and a loop; live KE / PE / total bars show energy converting as it speeds and climbs. A friction toggle bleeds energy away so the bars shrink, and the sim flags whether there is enough speed to complete the loop (v_top² ≥ gR).
