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planetary orbits
Moon
Earth
vice-versa
pull
heavenly bodies
neutron
molecules
attract (pull)
repel (push)
protons
repelling
air moves
weight
total weight
plane
drag
disruption
air flow
slowing force
thrust
reduced
stronger
energy
rotor
propeller
forwards
moving force
up
wings
lift
difference
air pressure
top surface
under surface
land
takeoff
fly
uniform motion
Newtons Principia
nature of reality
reaction force
movement
falling
accelerate
direction
matter
velocity
rates
material
original form
stretched
compressed
pulls