when a helicopter’s blades are spinning incredibly fast, why do they sometimes look distinguished as if they’re actually barely moving at all?

Question

when a helicopter’s blades are spinning incredibly fast, why do they sometimes look distinguished as if they’re actually barely moving at all?

In: Physics

Answer 1

Are you referring to videos of helicopters? Because this shouldn’t happen in real life. As for the videos, the rate of the spin of the blades simply matches the “shutter” speed of the camera, so that every time an image is generated the blades happen to be in the same or nearly the same position