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In physics, the Coriolis effect is an apparent deflection of moving objects when they are viewed from a rotating reference frame. For example, consider two children on opposite sides of a spinning roundabout (carousel), who are throwing a ball to each other. From the children's point of view, the ball's path is curved sideways by the Coriolis effect. From the thrower's perspective, the deflection is to the right with anticlockwise carousel rotation (viewed from above). Deflection is to the left with clockwise rotation.

Newton's laws of motion govern the motion of an object in an inertial frame of reference. When transforming Newton's laws to a rotating frame of reference, the Coriolis force appears, along with the centrifugal force. If the rotation speed of the frame is not constant, the Euler force will also appear. All three forces are proportional to the mass of the object. The Coriolis force is proportional to the speed of rotation and the centrifugal force is proportional to its