Lesson 5, Topic 3
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# Centre of Gravity

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### 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.

### 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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