The helicopter rises vertically. Draw the trajectory of points A and B located on the rotor

The helicopter rises vertically. Draw the trajectory of points A and B located on the rotor blades of the helicopter: a) relative to the pilot; b) relative to the Earth.

Any movement should be described in the chosen frame of reference, because the movement is relative. Any body can simultaneously move and be at rest relative to different reference points that a person chooses at his discretion.

A) Since the pilot moves upward with the helicopter, taking it for the reference body, we observe how the blades move relative to its point. Point A and point B draw circles in the air.

B) In the second case, the reference point is on the ground, therefore, the points of the blades of the helicopter rising from it move simultaneously in two planes – horizontal and vertical. That is, they spiral upward.