The Coriolis force (Accelerated frame)

The clip shows students rolling balls on a rotating platform. The paths of the balls are seen to be straight by a person standing on the ground but the camera is on the platform.

From the point of view of the students (and the camera) in the rotating accelerated frame of reference the paths of the balls are curved. The students believe there is a force acting at right angles to the ball velocity. The metal ball crosses the platform in a straight line, but in the time that takes, the girl in red has turned 180° to catch the ball on the other side. This Coriolis force is not real - it is an apparent force due to the inertia of the balls in the stationary frame of reference.

The camea is mounted on the rotating platform.

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