At the centre of the earth, the value of g becomes:
Correct answer: A. Zero
- A. Zero
- B. Infinity
- C. 9.8 ms-2
- D. None of the above
Explanation
At the center of the Earth, the value of gravitational acceleration (g) becomes zero. This is because, at the center, the mass above cancels out the gravitational forces from all directions, resulting in a net gravitational force of zero.
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Newton’s law of universal gravitation relates the force between masses to their masses and separation, while gravitational field strength explains weight and orbital motion. The topic covers satellite velocity and period, escape ideas, weightlessness in free fall, and artificial gravity, which differs from ordinary gravitational attraction.
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