physics / gravity.mdon commit [english] start Ransom & Invictus notes (b0fa307)
   1## Gravity
   2
   3Force that drives the universe - attractive force between masses
   41 of 4 fundamental forces
   5
   6$$
   7{F _{g} }= {{Gm_1m_2}\over{r^2}}
   8$$
   9
  10where
  11$G=$ gravitational constant $=6.67  \times10^{-11}Nm^2kg^{-2}$
  12$r=$ distance between *centres* of $m_1$ and $m_2$
  13
  14Area under force-distance graph = work = $\Delta E$
  15
  16# Newton