Soap-Powered Paper Fish

The fish shoots forward. Ask students to predict what will happen. Float fish and touch soap into the rear notch. Key idea: Soap lowers surface tension behind the fish, creating an imbalance that pulls it forward. Ask: What pushed the fish if nobody touched it? Safety and cleanup: Use fresh water for each run. https://www.google.com/search?q=%22Soap-Powered+Paper+Fish%22+science+demonstration+experiment