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.

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