D.4-Choosing formulae without losing physical reasoning

Decide whether a supplied formula is appropriate, identify each variable, convert units, rearrange correctly and explain the physical meaning of the result rather than relying on substitution alone.

Use d.4-choosing formulae without losing physical reasoning to connect the rule to the data and decision in the question.

This matters because d.4-choosing formulae without losing physical reasoning determines what can be inferred or chosen; begin with the stated conditions and keep the conclusion tied to the evidence.

Example: apply d.4-choosing formulae without losing physical reasoning to one small, clearly defined case, show the key step or comparison, and explain the result in words.

Boundary: use the formula and units given in the question, show the substitution and interpret the result; the calculation alone is not the conclusion.