Friday, March 9, 2012

Engineering Mechanics: Introduction

Engineering Mechanics - is a field of science that deals with forces and its effect on rigid bodies. Engineering Mechanics are subdivided into two parts:

  •  Statics - rigid bodies remains at rest while absorbing the effects and distributions of forces
    • Force System - any arrangement where in two or more forces act on a body or on group of related bodies. 
      • Three Major Divisions of Force System
        • Concurrent - all forces pass through a common point
        • Non-Concurrent - all of the lines of action of the forces in this system do not meet at one point
        • Parallel - forces whose line of action are parallel, in same or opposite direction
    • Applications - trusses, centroids, friction
  • Dynamics - rigid bodies motion caused by the force applied to it, it deals with bodies in motion
    • Kinematics - is the geometry of motion, the motion of a particle without considering the forces causing the motion
      • Motion of Particles
        • Translation - motion of rigid bodies where in a straight line pass through any two of its particles always remain to be parallel on its original position
        • Rotation - motion of rigid bodies where in the particles move in circular paths with centers or axis of rotation on a fixed straight line
        • Plane Motion - motion of rigid bodies where in all particles in the body remain at a constant distance form a fixed reference plane
    • Kinetics - relates the force action on the body to its mass and acceleration
      • Newton's Law of Motion
        • a body at rest will remain to be at rest or in motion will remain in motion along a straight path unless acted upon by unbalanced force
        • a particle acted upon by an unbalanced force system has an acceleration in line with and directly proportional to the resultant of the force system and inversely proportional to its mass
        • in every action there is always an equal and opposite reaction
      • D'Alembert's Principle
        • the resultant of the external forces applied to a body rigid or non-rigid composed of a system of particles is equivalent to the vector summation of the effective forces acting on all particles

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