A cylinder rolls up an inclined plane, reaches some height, and then rolls down (without slipping throughout these motions). The directions of the frictional force acting on the cylinder are

Question

A cylinder rolls up an inclined plane, reaches some height, and then rolls down (without slipping throughout these motions). The directions of the frictional force acting on the cylinder are, up the incline while ascending and down the incline while descending, up the incline while ascending as well as descending, down the incline while ascending and up the incline while descending, down the incline while ascending as well as descending

MARKS App · Accepted Answer

When cylinder rolls up the incline angular velocity decreases for that torque of friction should be in opposite direction of angular velocity. Therefore friction must be acting up the incline. When cylinder rollsdown the incline angular velocity increases for that torque of friction should be in same direction of angular velocity. Therefore friction must be acting up the incline.

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