Law of Conservation of Energy

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4 Terms

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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.