Law of Conservation of Energy
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Q11: What is the law of conservation of energy?
A11: Energy cannot be created or destroyed—only transformed or transferred.
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Q12: If a rollercoaster has 100 J of energy at the top, how much does it have at the bottom (ignoring losses)?
A12: 100 J – the total energy stays the same, it’s just transformed (potential → kinetic).
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Q13: What is energy efficiency?
A13: It’s how much useful energy output is gained from the total energy input.
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Q14: Why are LED lights more efficient than old light bulbs?
A14: They convert more electrical energy into light and waste less as heat.
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