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Orbital Speed & Weightlessness
AP Physics 1 Ā· Unit 6 Gravitation
Learning Objectives
v_orbit = ā(GM/r) for stable orbit
Astronauts are in free-fall ā apparent weightlessness
g decreases with altitude: g' = GM/(R+h)Ā²
ISS orbits at ~400 km, v ā 7.66 km/s
Tags
orbit
weightlessness
gravity
ISS
AP Physics 1
Altitude h (km)
400
Orbital Parameters
v_orbit
0
Period T
0
g at altitude
0
r (km)
0
Apparent W
0 N
% of g_surface
0