Law of Conservation of Energy Formulas |
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\( ( \frac{1}{2} \cdot m_f \cdot v_f^2 )+( m_f \cdot g_f \cdot h_f^2) \;=\; (\frac{1}{2} \cdot m_i \cdot v_i^2 ) + ( m_i \cdot g_i \cdot h_i^2 ) \) \( KE_f + PE_f \;=\; KE_i + PE_i \) |
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| Symbol | English | Metric |
| \( g \) = Gravity | \(ft\;/\;sec^2\) | \(m\;/\;s^2\) |
| \( h \) = Height | \(ft\) | \(m\) |
| \( m \) = Mass | \(lbm\) | \(kg\) |
| \( v \) = Velocity | \(ft\;/\;sec\) | \(m\;/\;s\) |
| \( KE \) = Kinetic Energy | \(bf-ft \) | \(J\) |
| \( PE \) = Potential Energy | \(lbf-ft \) | \(J\) |
| \( f \) = Final | - | - |
| \( i \) = Initial | - | - |
Law of conservation of energy is a fundamental principle of physics stating that energy cannot be created or destroyed in an isolated system, it can only be transformed from one form to another. This law is a direct consequence of the invariance of physical laws with respect to time. In engineering and physics practice, it is expressed quantitatively through energy balance equations applied to defined systems and control volumes.
In classical mechanics, as formulated in the framework established by Isaac Newton, the law implies that the sum of kinetic energy and potential energy remains constant for a closed system acted upon only by conservative forces. In thermodynamics, the Law of Conservation of Energy is formalized as the first law of thermodynamics. It states that the change in internal energy of a system equals the heat added to the system minus the work done by the system.
Energy Types - Chemical Energy / Electrical Energy / Internal Energy / Kinetic Energy / Mechanical Energy / Potential Energy / Rest Energy / Spring Energy / Thermal Energy / Work Energy
