Lateral force and movement direction of cylinder

MATHS AND PHYSICS... WORLD How moves the cylinder exerting lateral force through the thread (variable radius point) ... right or left ... and why ... First attempt of "moving camera" ... Check the cylinder moving with 200km / h (up to 1000km / h with something very strange happening then) ... travels for miles around ... and the "illusions" of our limited visual perception ... (The default cursor position in "Slow-Fast" is ... real-time ..)