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Define mass, weight and centre of gravit...

Define mass, weight and centre of gravity.

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Amount of matter contained in a body is called mass.
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The centre of gravity

Define centre of gravity.

Assertion : At the centre of earth, a body has centre of mass , but no centre of gravity. Reason : This is because g = 0 at the centre of earth.

Does centre of mass and centre of gravity body always coincide?

What is the difference between centre of mass and centre of gravity?

Assertion: Centre of mass of a rigid body always liees inside the body. Reason: Centre of mass and centre of gravity coincide if gravity is uniform.

Statement-1 : The centre of mass and centre of gravity of a body are two different positions in general. and Statement-2 : The centre of mass and centre of gravity of a body coincide if graviational field is unifrom.

Assertion : The moment of inertia of a rigid body reduces to its minimum value, when the axis of rotation passes through its centre of gravity. Reason : The weight of a rigid body always acts through its centre of gravity.

Explain what is meant by centre of gravity.

The centre of mass of an extended body on the surface of the earth and its centre of gravity