F g = G m 1 · m 2 r 2
γ → = F → g m
E p = − G m 1 · m 2 r
Δ E p = m · g · Δ h
v I = G · M z R z = 7,9 km s v II = 2 · G · M z R z = 11,2 km s
T 1 2 R 1 3 = T 2 2 R 2 3 = const
F → s = − k · x →
E pot = 1 2 k · x 2
T k = μ k · F N
T s ≤ μ s · F N