- #1
mmainak
- 8
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Actually I am a bit confused with the direction of the frictional force acting on a rotating disk on an inclined plane.
I need to find the direction of frictional force on the rotating disk both the cases when it is going up and coming down under the action of an impulsive force applied on it which made it climb through a distance along the inclined plane.
In my knowledge, if no friction acting in between them the disk would simply rotate at the same place. When we apply friction it's free rotation is obstructed and it will move on the plane while the friction is actually acting in direction of its motion.
So for a rotating disk friction acts along the motion.
But when I check the answer of the problem it is given that while it is going up the friction will act opposite to it's motion to decrease it's angular momentum.
I need a bit clarification in this regard.
I need to find the direction of frictional force on the rotating disk both the cases when it is going up and coming down under the action of an impulsive force applied on it which made it climb through a distance along the inclined plane.
The Attempt at a Solution
In my knowledge, if no friction acting in between them the disk would simply rotate at the same place. When we apply friction it's free rotation is obstructed and it will move on the plane while the friction is actually acting in direction of its motion.
So for a rotating disk friction acts along the motion.
But when I check the answer of the problem it is given that while it is going up the friction will act opposite to it's motion to decrease it's angular momentum.
I need a bit clarification in this regard.