![]() Newton's Law of Gravity, and this works for most purposes. It's really, at least to me,Ī little bit mystical. Objects, just because they have this thing called Kind of say, oh, well, it's the warping of space time andĪll of this, but it's hard to get an intuition of why two Relativity, if you do get there, I have to say, you can Important variables in it, but it's something that's really Something that, especially in introductory physics orĮven reasonably advanced physics, we can learn how toĬalculate it, we can learn how to realize what are the If you want to know how G came about, read on the "Cavendish experiment" ![]() Everest your radius will be larger than if you were in Death Valley. That is why g can change from place to place on earth. If you are twice as far out 2*r, you will have 4 times less gravitational acceleration. Notice if you change your radius that the acceleration(g) will fall off as 1/r^2. If you put in the mass of the earth and the radius to sea level you will get 9.8 m/s^2 for a. Notice that little m cancels out on both sides of the equation. Here you use the radius of the earth for r, the distance to sea level from the center of the earth, and M is the mass of the earth. You get this value from the Law of Universal Gravitation. The 9.8 m/s^2 is the acceleration of an object due to gravity at sea level on earth. ![]() G is the local acceleration due to gravity between 2 objects. ![]() G is the universal constant for the gravitational force. ![]()
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