(^78) „„„„„ A Textbook of Engineering Mechanics
78

Centre of Gravity

6

CHAPTERCHAPTERCHAPTERCHAPTERCHAPTER

Contents

1. Introduction.


2. Centroid.


3. Methods for Centre of
   Gravity.


4. Centre of Gravity by
   Geometrical
   Considerations.


5. Centre of Gravity by
   Moments.


6. Axis of Reference.


7. Centre of Gravity of Plane
   Figures.


8. Centre of Gravity of
   Symmetrical Sections.


9. Centre of Gravity of
   Unsymmetrical Sections.


10. Centre of Gravity of Solid
    Bodies.


11. Centre of Gravity of
    6.1. INTRODUCTION Sections with Cut out Holes.
    It has been established, since long, that every
    particle of a body is attracted by the earth towards its
    centre. The force of attraction, which is proportional to
    the mass of the particle, acts vertically downwards and
    is known as weight of the body. As the *distance between
    the different particles of a body and the centre of the
    earth is the same, therefore these forces may be taken to
    act along parallel lines.
    We have already discussed in Art. 4.6 that a point
    may be found out in a body, through which the
    resultant of all such parallel forces act. This point,

* Strictly speaking, this distance is not the same. But it

is taken to the same, because of the very small size of

the body as compared to the earth.