LAW OF PARALLELOGRAM || ENGINEERING MECHANICS | UNIT - 1| 2ND SEM ALL BRANCH || 2026-27

Описание: इस वीडियो में ENGGINEERING MECHANICS के Unit–1: WHAT IS MECHANICS को आसान और स्पष्ट हिंदी भाषा में समझाया गया है।
यह वीडियो ALL BRANCHES 2ND Semester (Polytechnic / Diploma) के छात्रों के लिए बहुत उपयोगी है।
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WHAT WE WILL COVER
Unit – I Introduction to Engineering Mechanics and Force System : (08 Periods)
Basic Concept and definitions, Law of Mechanics (Newton’s Laws), Classification: Statics and
Dynamics.
Principle of transmissibility of forces, System of forces and its classification, Moment of Force and
couple, Resolution of force- Orthogonal component of force, Varignon’s theorem, Composition of forcesAnalytical method for determination of resultant for concurrent, non- concurrent and parallel co- planar
force systems- Law of triangle, parallelogram and polygon of forces.
Unit– II Equilibrium of Forces and Concept of Beam: (10 Periods)
Condition of equilibrium, free body diagram (FBD), equilibrium of coplanar concurrent and nonconcurrent forces, Lami’s Theorem- statement and explanation, application for various engineering
problems.
Beam- Types of beam, supports (simple, hinged, roller and fixed) and loads acting on beam ( Vertical
and inclined point load, uniformly distributed load, couple). Beam reaction for cantilever, simply
supported beam with or without overhang subjected to combination of point load and uniformly
distributedload.
Unit– III Friction : (06 Periods)
Introduction , types and Laws of friction, Co-efficient of friction, angle of friction, angle of repose, cone
of friction, equilibrium of bodies on horizontal surface (force parallel and inclined to the plane) and
inclined plane (force parallel to the plane only).
Unit– IV Centroid and Moment of Inertia : (10 Periods)
Concept, definition and determination of Centroid of plain figures (square, rectangle, triangle, circle,
semi-circle, quarter circle) and Centre of gravity of symmetrical solid bodies (Cube, cuboid, cone,
cylinder, sphere, hemisphere).
Concept of moment of inertia, Perpendicular axis theorem and Parallel axis theorem. Concept of second
moment of area ( Rectangle, Triangle and circle) and composite section (L,T &I).
Unit – V Simple Machines : (08 Periods)
Definition and types, mechanical advantage, velocity ratio. Application and efficiency of simple
machines, Law of Machines, Ideal machine, reversible and irreversible machine.
System of pulleys (first, second, third system of pulleys) determination of velocity ratio, mechanical
advantage and efficiency. Working Principle and application of : wheel and axel, simple screw jack,
Worm and worm wheel, single and double winch Crab.

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