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| 183_notes:fundamental_principles [2021/05/11 18:49] – [The Three Fundamental Principles of Mechanics] stumptyl | 183_notes:fundamental_principles [2021/05/11 18:50] (current) – [The Momentum Principle] stumptyl | ||
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| ==== The Momentum Principle ==== | ==== The Momentum Principle ==== | ||
| - | The momentum principle describes how the momentum of a system will change as a result of external forces. It is a vector principle as it describes how an system will move in three dimensions. | + | **The momentum principle describes how the momentum of a system will change as a result of external forces.** It is a vector principle as it describes how an system will move in three dimensions. |
| $$\Delta \vec{p}_{sys} = \vec{F}_{ext} \Delta t$$ | $$\Delta \vec{p}_{sys} = \vec{F}_{ext} \Delta t$$ | ||
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| ==== The Energy Principle ==== | ==== The Energy Principle ==== | ||
| - | The energy principle describes how the energy of a system will change as a result of external work and energy exchange due to a temperature difference. It is a scalar principle as it describes how energy is transferred in and out as well as around a system in different forms. | + | **The energy principle describes how the energy of a system will change as a result of external work and energy exchange due to a temperature difference.** It is a scalar principle as it describes how energy is transferred in and out as well as around a system in different forms. |
| $$\Delta E_{sys} = W + Q$$ | $$\Delta E_{sys} = W + Q$$ | ||
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| ==== The Angular Momentum Principle ==== | ==== The Angular Momentum Principle ==== | ||
| - | The angular momentum principle describes how the angular momentum of a system will change as a result of external torques. It is a vector principle as it describes how a system will rotate or translate in 3 dimensions. | + | **The angular momentum principle describes how the angular momentum of a system will change as a result of external torques.** It is a vector principle as it describes how a system will rotate or translate in 3 dimensions. |
| $$\Delta \vec{L}_{sys} = \vec{\tau}_{ext} \Delta t$$ | $$\Delta \vec{L}_{sys} = \vec{\tau}_{ext} \Delta t$$ | ||