यांत्रिकी (Mechanics) भौतिकी की वह शाखा है जिसमें पिण्डों पर बल लगाने या विस्थापित करने पर उनके व्यवहार का अध्ययन करती है। यांत्रिकी की जड़ें कई प्राचीन सभ्यताओं से निकली हैं।
हैमिल्टनी यांत्रिकी (Hamiltonian mechanics), a theoretical formalism, based on the principle of conservation of energy.
लाग्राञी यांत्रिकी (Lagrangian mechanics), another theoretical formalism, based on the principle of the least action.
क्लासिकी सांख्यिकीय यांत्रिकी (Classical statistical mechanics) generalizes ordinary classical mechanics to consider systems in an unknown state; often used to derive thermodynamic properties.
खगोलीय यांत्रिकी (Celestial mechanics), the motion of bodies in space: planets, comets, stars, galaxies, etc.
जैवयांत्रिकी (Biomechanics), solids, fluids, etc. in biology
जैवभौतिकी (Biophysics), physical processes in living organisms
आपेक्षिक भौतिकी (Relativistic]] or Einsteinian mechanics, universal gravitation.
क्वाण्टम यांत्रिकी
श्रोडिंगर का तरंग समीकरण, used to describe the movements of the wavefunction of a single particle.
मैट्रिक्स यांत्रिकी (Matrix mechanics) is an alternative formulation that allows considering systems with a finite-dimensional state space.
क्वाण्टम सांख्यिकीय यांत्रिकी (Quantum statistical mechanics) generalizes ordinary quantum mechanics to consider systems in an unknown state; often used to derive thermodynamic properties.
कण भौतिकी (Particle physics), the motion, structure, and reactions of particles
नभिकीय भौतिकी (Nuclear physics), the motion, structure, and reactions of nuclei
संघनित पदार्थ भौतिकी (Condensed matter physics), quantum gases, solids, liquids, etc.
निम्नांकित चित्र में यांत्रिकी के विभिन्न क्षेत्रों का विहंगम दृश्य दिखाया गया है-
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