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Forces&Motion 5-3
5-3 Conservation of Energy
Question | Answer |
---|---|
What is Friction? | A force that opposes motion between two surfaces that are in contact. |
What is the Law of Conservation of Energy? | The law that states that energy cannot be created or destroyed but can be changed from one form to another. |
Why is the law of conservation of energy considered a scientific law? | Because no exception to it has ever been observed |
What is a closed system? | A group of objects that transfer only to each other. |
Why is "perpetual motion" impossible? | Because energy conversions always result in the production of waste thermal energy |
What is energy efficiency? | the comparison of the amount of energy before a conversion with the amount of useful energy after a conversion. |