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Energy
Exam 4 Study Guide
Question | Answer |
---|---|
Define "energy". | the capacity of a physical system to do work |
What is "potential energy"? | energy stored in matter |
What are some examples of gravitational and chemical forms of potential energy? | Gravitational: boulder balanced on a cliff; an apple or acorn in a tree; stored energy due to water behind a dam. Chemical: fossil fuel and woods; nutrients; ATP |
What is "kinetic energy"? | energy contained in moving matter |
What are some examples of kinetic energy? | Kinetic: an apple falling from a tree; boulder rolling downhill; water rushing out of dam; a roller coaster or train rolling down track; flow of electrons in an electric current. |
What are the 1st and 2nd laws of thermodynamics? | 1st law: amount of energy in the universe is constant. 2nd law: every energy transfer that takes place will increase entropy (disorder) of the universe and reduce amount of usable energy available to do work |
How do these laws affect physical system and living organisms? | cells must capture, store and use energy to maintain organization and not fall into death and chemical reaction isn't 100% because they produce metabolic heat as a by-product |
What is "entropy" and how does an input of energy affect entropy? | Entropy=randomness or disorder; it affects entropy because there is a loss of energy which increases entropy and no energy transfer is 100% |
Are energy transfers 100% efficient? | No |
What is produced as a by-product of energy transfer? | metabolic heat |