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The strength of the pull of gravity, g, can be measured in SI units as newtons per kilogram (N kg-1). However, it can also be expressed in base units as metres per second squared (m s-2), which is a unit of acceleration. The two are equivalent, because g is the rate at which an object will accelerate if allowed to free-fall under gravity, assuming there are no energy losses (such as air resistance).

On the surface of Earth, g is about 9.8 m s-2, though it varies slightly depending on where in the world you measure it. On the surface of the moon, it is only about 1.6 m s-2, and on the surface of Jupiter it is 24.8 m s-2.

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Q: What is the SI unit for gravitational-force?
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