We were discussing various important topics based on theÂ basics of centrifugal compressorÂ andÂ hydraulic turbinesÂ in our previous posts.Â

Today we will be interested here to start here a very important subject i.e. engineering mechanics with the help of this post. We will secure here the various principles and concepts of engineering mechanics such as rigid and deformable bodies, basic concepts of force i.e. Concept of force system in engineering mechanics, understanding of free body diagram, equilibrium of forces and rigid bodies, basics of supports, basics aspects of friction, basics of trusses etc.Â Â

So, let us start here first with the difference between rigid and deformable bodies with the help of this post.Â

### Distinguish between rigid and deformable bodiesÂ

We are here to understand the very basic and important concept of engineering mechanics i.e. difference between rigid and deformable bodies.Â

### Rigid bodyÂ

Rigid body is basically defined as a body where changes in the distance between any two of its points is negligible.Â

In case of rigid body, all the points will maintain the same position with respect to another points and we may not change the shape or deform the body by any way.Â

In practical, there is not a body of such type i.e. perfectly rigid body and therefore this is only one idealization.Â

### Deformable bodyÂ

Deformable body is basically defined as a body where changes in the distance between any two of its points could not be neglected.Â

In case of deformable body, all the points will not maintain the same position with respect to another points and we may change the shape or deform the body by applying the any kind of external force.Â

Therefore, we have seen here theÂ basicÂ difference between rigid and deformable bodiesÂ with the help of this post.Â  Â

Further we will see other various basic concept of engineering mechanics such as concept of force system,Â principle of transmissibility of forcesÂ and its limitations,Â classification of force system,Â body force and surface forceÂ in mechanics.Â  Â

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Further we will find out, in our next post,Â varignon's theorem in engineering mechanics.Â  Â

### Reference:Â Â

Engineering Mechanics, By Prof K. RameshÂ