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Question 30381
JEE Physics · Hard

Rigid Body Dynamics: Advanced — Pure Rolling on Incline MCQ

Solve this quality-checked JEE multiple-choice question, then review the correct answer and explanation.

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Advanced — Pure Rolling on InclineHardQuestion 30381

Question

A disc rolls without slipping down an incline. The friction force acts:
  1. A
    Down the incline
  2. B
    Up the incline
    Correct
  3. C
    Perpendicular to incline
  4. D
    Zero

Correct answer

Up the incline

Explanation

Without friction, the base of the disc would slide forward (down the slope). Static friction acts opposite to this tendency — up the incline. This friction provides the torque needed for angular acceleration.

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