Topic Content:
- Definition of Centre of Gravity
- Determine the Position of the Centre of Gravity of an Irregular Object
- Use of a Plumbline
- Using the Balancing Method
- Determining the Weight of an Object by the Principle of Moments
The Centre of gravity of a body is the point at which the total weight of a body appears to be concentrated.
or
The Centre of gravity of a body is the point at which the total weight of a body appears to pass through.
Centre of mass of a body is the point at which the total mass of a body appears to pass through or concentrated.
The Centre of gravity for objects varies as shown below.
 | For a Uniform rod, the centre of gravity is at the mid-point of the centre rule. |
 | For a Uniform Circular Plate, the centre of gravity is at the mid-point of the circular plate. |
 | For a Uniform Circular Ring, the centre of gravity is at the centre of the ring. |
 | For a Uniform Rectangular Sheet, the centre of gravity is at the point of intersection of the diagonals. |
 | For a Uniform Triangular Plate, the centre of gravity is at the point of intersection of the medians. |
Determine the Position of the Centre of Gravity of an Irregular Object:
The centre of gravity of irregular-shaped objects can be determined by suspension with a plumb line from two or more points or by balancing the body on a knife-edge.
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