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183_notes:energy_cons [2021/03/12 02:40] – [The Total Energy of a System Can Change] stumptyl | 183_notes:energy_cons [2021/05/25 15:53] (current) – [Multi-particle Systems] stumptyl | ||
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==== The Total Energy of a System Can Change ==== | ==== The Total Energy of a System Can Change ==== | ||
- | [{{ 183_notes:conservation_of_energy.001.png? | + | [{{ 183_notes:system_work_7.png? |
- | [{{ 183_notes:conservation_of_energy.002.png? | + | [{{ 183_notes:system_work_7.1.png? |
__**We observe that the total change in energy of a system and the system surroundings is zero.**__ This means that whatever energy change we observe in the system, is exactly taken up by the surroundings. That is, if the system energy goes down, then the energy of the surroundings must go up. | __**We observe that the total change in energy of a system and the system surroundings is zero.**__ This means that whatever energy change we observe in the system, is exactly taken up by the surroundings. That is, if the system energy goes down, then the energy of the surroundings must go up. | ||
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==== Defining systems ==== | ==== Defining systems ==== | ||
- | In your work with the [[183_notes: | + | In your work with the [[183_notes: |
In applying energy conservation to different systems, it can be challenging to keep track of all the important elements. You will need to be systematic, and the following 3 steps will help: | In applying energy conservation to different systems, it can be challenging to keep track of all the important elements. You will need to be systematic, and the following 3 steps will help: | ||
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==== Multi-particle Systems ==== | ==== Multi-particle Systems ==== | ||
- | [{{ 183_notes:system_puzzle.png? | + | [{{ 183_notes:earth_7.png? |
Consider a ball initially at rest that begins to fall towards the Earth. | Consider a ball initially at rest that begins to fall towards the Earth. |