Please 1 question Please Student 1 A ceiling fan is rotating

Please 1 question. Please

Student: 1. A ceiling fan is rotating in clockwise direction (as viewed from below), but it is slowing down. What are the directions of and ? 2. Using momentum and force principles, explain why an air has rd ucrs iniun in

Solution

The direction of the angular velocity () vector is perpendicular to the plane of rotation, in a direction which is usually specified by the right-hand rule.

The fan is moving counter clockwise as seen from upwards. In a coordinate system where upward direction is positive, So the axis of rotation of fan is upwards, so directon of is upward along the axis of fan.

As the rotation is slowing down, the angular accleration direction will be opposite to , i.e. downwards.