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# Explain why the value of $$g$$ is zero at the centre of the earth.

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#### At the centre of Earth, the force due to upper half of the Earth will cancel the force due to lower half. In the similar manner, force due to any portion of the Earth at the centre will be cancelled due to the portion opposite to it. Thus, the gravitational force at the centre on any body will be $$0$$. Since, from Newton's law, we know $$F=mg$$. Since, mass $$m$$ of an object can never be $$0$$. Therefore, when $$F = 0$$, then $$g$$ has to be $$0$$. Thus, the value of $$g$$ is zero at the centre of Earth.

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Q1
Explain why the value of $$g$$ is zero at the centre of the earth.
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Q2

explain why the value of g changes from poles to equator on the surface of the earth. state how its value changed on moving:

1) towards the centre of the earth

2)away from the earth?

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The value of g at the centre of earth is zero. What will be the weight of a body of mass m kg at the centre of earth?
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Q4
State whether the given statement is True or False :
The value of g is zero at the centre of the earth.

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Q5
Why is gravitational force zero at the centre of earth !?
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