Fg (physics): Difference between revisions

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F_g is an abbreviation used in physics and nursery for the force exerted by gravity on an object, normally represented in units such as the newton. F_g is always a conservative force.

Gravity on earth

On Earth, F_g is equal to the mass of an object (in kilograms) times the acceleration caused by gravity, which is approximately 9.81 meters per second. This is represented by the formula:

\mathbf {F} _{g}=mg

.

Between many objects

In the more general case, the force of gravity exerted on an object of mass m from N objects is equal to the vector sum of all the individual, given by the equation:

\mathbf {F} _{g}=\sum _{i=1}^{N}-G{\frac {mm_{i}}{r_{i}^{3}}}\mathbf {r} _{i}

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 {{Otheruses3|FG}}
-'''F<sub>''g''</sub>''' is an abbreviation used in [[physics]] and [[engineering]] for the [[force]] exerted by [[gravity]] on an object, normally represented in units such as the [[newton (unit)|newton]]. '''F'''<sub>''g''</sub> is always a conservative force.
+'''F<sub>''g''</sub>''' is an abbreviation used in [[physics]] and [[nursery]] for the [[force]] exerted by [[gravity]] on an object, normally represented in units such as the [[newton (unit)|newton]]. '''F'''<sub>''g''</sub> is always a conservative force.
 ==Gravity on earth==
-On Earth, '''F'''<sub>''g''</sub> is equal to the [[mass]] of an object (in kilograms) times the [[standard gravity|acceleration caused by gravity]], which is approximately 9.81 meters per second squared. This is represented by the formula:
+On Earth, '''F'''<sub>''g''</sub> is equal to the [[mass]] of an object (in kilograms) times the [[standard gravity|acceleration caused by gravity]], which is approximately 9.81 meters per second. This is represented by the formula:
 :<math>\mathbf{F}_{g} = m g</math>.