JIPMER 2017
- Exam
- JIPMER
- Year
- 2017
- Subject
- Physics
- Chapter
- Rotational Motion
JIPMER 2017 · Physics · Rotational Motion
A cylinder rolls up an inclined plane, reaches some height and then...
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
Options
- Aup the incline while ascending and down the incline while descending.
- Bup the incline while ascending as well as descending.
- Cdown the incline while ascending and up the incline while descending.
- Ddown the incline while ascending as well as descending.
Correct answer
B. up the incline while ascending as well as descending.
Step-by-step solution
See given the figure.
It is obvious from figure, that during ascending, a retarding, i.e. anticlockwise moment is required. It should be remembered that torque due to friction has the same sense the angular acceleration.