B.5.MPC:4.2 - Propose the physical account and the observations it needs

Identify the participants, interactions and configurations that could determine the requested difference. Give separately used quantities their participants and reference conditions: the robot’s distance to a wall before motion, its distance afterwards and its displacement are three quantities, even though each is called a distance. Start from the arrangement and relevant subject knowledge. For a rolling robot, distinguish wheel, motor, transmission and ground contact. For gears, distinguish an actual contact from proximity in a drawing. For admission cards, distinguish a material card, its holder, the room boundary and the permitted transfers.

State the applicable physical or operating rules. Explain why a rule supplies the needed relation and where it is an assumption. Wheel rotation yields a distance relation only under the chosen rolling and geometry conditions. Exclusive possession of a card supports an admission limit only when the entrance procedure connects possession to entry and return. A.3.3 helps construct configurations, retained state and allowed continuations; the subject practice supplies the laws and mechanisms those continuations use.

Choose a sufficient account for the present question. A direction or impossibility result may need less physical detail than a trajectory, speed or load calculation. Make an omitted interaction explicit when it could defeat the inference: slip changes wheel travel, a moving gear carrier changes relative rotation, and uncontrolled entry breaks the visitor-to-card association.

When observations supply an input or test a consequence, construct the relation between the sought quantity and the indication. Use C.16:5.3 and C.16:5.4 for the measurement method and model. Motor counts can indicate motor rotation under an encoder account; using them to establish travel additionally consumes the transmission and ground-contact account. If the available indication cannot distinguish the cases needed by the question, obtain a different observation, use an adequate bound, or change the question.

Return a proposed physical account and its consequences under stated conditions. An unknown interaction or calibration is a useful missing contribution when it determines which mathematical question can be constructed.