Question:
in part 9 of the chapter rotational motion(class 11 ,physics) how does the direction of omega is defined?
This is the link of the video: http://www.examfear.com/free-video-lesson/Class-11/Physics/Rotational-Motion/part-9/Rotational_Motion_Part_9_(Angular_velocity).htm
Answer:
The Direction of angular velocity ω is along the axis of rotation.
See the below figures
Suppose any particle is moving at this circular path, the blue arrow is showing the direction of rotation.
So, the direction of ω is along the axis of rotation, and perpendicular to the plane of rotation.
There is a rule to find the direction of ω.
The Right hand rule- It states that when we curl the fingers of our right hand in the direction of rotation, then the thumb gives the direction of ω, along the axis of rotation.
(See figures)
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