direction)
1.
Radial
Centripetal
Centripetal + Coriolis
Centripetal + Tangential
Centripetal + Coriolis + Tangential
Centripetal + Coriolis + Tangential + Radial
Radial + Centripetal + Coriolis
2. Coriolis and tangential (the
direction)
3. Radial and centripetal (the 
and the -
directions)
4. Radial acceleration, because it "pushes" the particle radially out as the spiral forms.