Question

Write the rules for sign convention

Answer 1

physics, asign conventionis a choice of the physical significance ofsigns(plus or minus) for a set of quantities, in a case where the choice of sign is arbitrary. "Arbitrary" here means that the same physical system can be correctlydescribed using different choices for the signs, as long as one set of definitions is usedconsistently. The choices made may differ between authors. Disagreement about sign conventions is a frequent source of confusion, frustration, misunderstandings, and even outright errors in scientific work. In general, a sign convention is a special case of a choice ofcoordinate systemfor the case of one dimension.