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 -

• A. Up the incline while ascending and down the incline while descending
• B. Up the incline while ascending as well as descending
• C. Down the incline while ascending and up the incline while descending
• D. Down the incline while ascending as well as descending

Answer 1

The correct option is B Up the incline while ascending as well as descending

While ascending velocity decreases and friction acts upwards to reduce angular velocity. Similarly, while descending velocity increases and so does angular velocity.