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Computer simulations can help in visualising physical quantities that are difficult to observe directly. The PhET simulations (https://phet.colorado.edu) provide interactive models, such as Energy Skate Park, Energy Forms and Changes, Pendulum Lab, and Masses and Springs. Use these to explore how different forms of energy change as parameters, such as mass, height, and friction are varied.
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In Energy Skate Park, watch the KE and PE bars swap as the skater rises and falls while the total stays constant — until you add friction, when the total mechanical energy slowly drops as thermal energy rises. Changing mass and height scales the energies, showing K = ½mv² and U = mgh in action.
🌌 The Quest Continues
- Scientists have found that the Universe is not only expanding but expanding faster and faster . To explain this, they propose a mysterious form of energy called dark energy , which cannot be exchanged with other forms of energy.
- Studying its effects matters because dark energy may decide the fate of the Universe billions of years into the future.
