Discussion
Force of gravity on the surface of earth is least at
Answer: A
The force of gravity is least at the equator.
Two effects combine. The Earth bulges at the equator, so a point there is farther from the centre and gravitational attraction is weaker. And the Earth's rotation is fastest at the equator, so more of the pull is used up providing the centripetal force for the circular motion. Together they make the effective value of g lowest there, about 9.78 m/s2.
At the poles both effects vanish, so g is greatest, about 9.83 m/s2. Points in between take intermediate values.
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