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Surface of the Earth

Most of us will spend most of our lives on or near the surface of the Earth. What is the force of gravity of the Earth on an object of mass m? The force is


where we use a calculation from the previous section. This number 9.8 m/s2 comes up so often in introductory physics that we have given it a name: The acceleration due to gravity is


In working problems, however, we always approximate this as g = 10 m/s2 (even if the problem says to use 9.8 m/s2).


Please note: Whenever there is gravity and we are at the surface of the Earth, which is in most problems, we will use


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