Introduction to Dynamics

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Introduction to Dynamics

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DYNAMICS: PART OF RIGID BODY MECHANICS  In Chapter 1 of the book we had defined Mechanics as that branch of physical science which is concerned with the resultant effect of forces on bodies, both in a state of rest or in motion. Mechanics is subdivided into three branches viz. Mechanics of Rigid Bodies, Mechanics of Deformable Bodies and Mechanics of Fluids.  Mechanics of Rigid Bodies is the branch of Mechanics where the body is assumed to be perfectly rigid i.e there is no relative movement between the particles forming the body and also there is no deformation of the body under the action of the forces. Though engineering structures and machines do have slight deformation under the action of loads, still they are treated as rigid bodies since the deformations are very small and they can be neglected. We can thus apply the conditions of equilibrium to such static bodies and the equations of motions to moving bodies.  Mechanics of Rigid Bodies is further divided into Statics and Dynamics. Statics is that part of Rigid Body Mechanics which analysis bodies at rest. On the other hand, Dynamics is that part of Rigid Body Mechanics which analyses motion of moving bodies. By the application of motion analysis we wish to gather information about the following parameters of a moving body. 1) the path traced by moving body 2) the rate at which the body moves 3) the time aspect of motion 4) the position occupied by the body during motion 5) the forces acting on the body which are responsible for the motion 6) the relation between the forces and the motion so produced

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