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Question:

How to determine the direction of friction in the conveyor belt problem?

How to determine the direction of friction in the conveyor belt problem? For example, an object from the oblique conveyor belt down, the belt clockwise movement, then what direction of friction, how to judge? The same circumstances, if it is counter-clockwise movement, what is the direction of friction? Seek advice! More

Answer:

And the opposite direction of movement.
The direction of friction is the same as the direction of movement of the object. Will not ask again.
The direction of friction and the direction of movement in the opposite direction, if the belt occurs on the sliding, the friction is the opposite direction of sliding, regardless of whether the conveyor belt rotation relative to the conveyor belt is still, the friction is the direction of rotation of the conveyor belt
From the oblique conveyor belt down, the conveyor belt clockwise movement, the object is because the conveyor belt friction and gravity on the results of the role, so the direction of friction by the object parallel to the slope down; if it is counterclockwise movement, Object slip is the result of gravity, the conveyor belt of its friction to the role of slipping, so the direction of parallel with the slope

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