PHY.2:4.2 - Propose mechanisms by the physical effect they supply

Ask what the source must retain, transfer, resist, amplify, constrain or change. Then choose physical processes that can perform those contributions under known laws. These are prompts for selecting relevant effects, not a required inventory of every source.

For example, a mass retains motion while a force changes it; a deformable body stores energy under loading; a capacitor accumulates charge while current flows; a dissipative interaction converts organized motion into less accessible energy. A driven body can maintain motion by drawing on an energy supply. A stochastic transition account can express unresolved switching between physically different states. Choose among such mechanisms from the target relation and the proposed source conditions.

Write or explain the law of each chosen interaction, its participants and its regime. Include direction and sign: a coupling can restore a displacement or increase it. Identify what is being approximated when a law is linearized or treated as instantaneous. When no suitable law is available, retain the interaction as the physical contribution still to be found.

A source can combine contributions from several familiar arrangements. Derive the behavior of that combination. A chain of separately plausible resemblances can leave an unconstructed connection in the middle; locate the participants and interaction at that connection. Mathematical formulation through MMP.10 or MMP.11 makes the resulting conditions easier to solve.