I can change shape and state, I am harnessed for work, but I am never destroyed. What am I?
Category: Science · Difficulty: expert
Hint: Think about what powers machines.
Answer
Energy in systems
Explanation
Energy in systems transforms between forms but is conserved, while matter and force are different concepts in physics.
This is a expert science riddle — one of the harder riddles here. The answer is Energy in systems.
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