Which of the following is NOT a principle of engineering mechanics?

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Consider the question: Which of the following is NOT a principle of engineering mechanics? 
Option 1: 'Newton's First Law' is a foundational principle of mechanics, describing inertia and the behavior of bodies at rest or in uniform motion unless acted upon by a net external force. This is a core concept in engineering mechanics, so it is correctly classified as a mechanics principle.
Option 2: 'Archimedes' Principle' concerns buoyancy and the upward force on a submerged or floating body in a fluid. While it relates to fluids, it is frequently used in engineering problems involving fluid statics and buoyant forces, making it a legitimate principle in the broader sense of engineering mechanics when fluid interactions are involved.
Option 3: 'Hooke's Law' expresses the linear relationship between force and deformation for springs (F = k x). It is a fundamental constitutive relation in solid mechanics and structural analysis, and thus clearly falls under engineering mechanics principles.
Option 4: 'Ohm's Law' states the relationship V = I R between voltage, current, and resistance in electrical circuits. This is a principle of electricity and circuit theory, not a principle of engineering mechanics, which deals with forces, motions, fluids, and deformations. The inclusion of Ohm's Law here is the mismatch that identifies it as not belonging to engineering mechanics.

In summary, the non-mechanics principle among the options is Ohm's Law, since it governs electrical behavior rather than mechanical interactions such as inertia, buoyancy, or spring deformation.

MIET6362C_MEM23109 & MATH5361C_MEM30005 & MATH5362C_MEM30006 Learning Checkpoint: MEM23109 Module 1

Which of the following is NOT a principle of engineering mechanics?

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