# What is Centre of Gravity and Centroid of a Body?

### Centre of gravity

Centre of gravity of a body is defined as the point through

which the whole weight of the body acts. A body can have only one centre of

gravity for all positions of the body. It is represented or denoted by C.G. or

G.

which the whole weight of the body acts. A body can have only one centre of

gravity for all positions of the body. It is represented or denoted by C.G. or

G.

### Centroid

The point, at which the total area of a plane figure (such

as rectangle, triangle, square, quadrilateral, circle etc) is assumed to be

concentrated, is called the centroid of that area. The centroid is also

represented by C.G. or G.The centroid and centre of gravity are at the same point.

as rectangle, triangle, square, quadrilateral, circle etc) is assumed to be

concentrated, is called the centroid of that area. The centroid is also

represented by C.G. or G.The centroid and centre of gravity are at the same point.

#### Centroid or centre of gravity of simple plane figures:

- The C.G. of a uniform rod lies at its middle point.

- The C.G. of a triangle lies at the point where all the three

medians intersect each other.

- The C.G. of a rectangle (or a parallelogram or a square) lies at the

point where its diagonals intersect each other. It is also the point of

intersection of the middle points of the opposite sides.

- The C.G. of a circle lies at its centre.

**For better understanding watch below videos**