The designation of zero potential energy as the height of the trampoline is a boundary condition of the model. It involves the minimum potential energy principle.
The minimum potential energy principle is a key concept in different disciplines, including, among others, physics, thermodynamics and chemistry.
This principle states that a structure will deform and/or will change its position to minimize the total potential energy.
The minimum potential energy principle states that the loss of potential energy is due to its dissipation as heat.
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