Home/
Competitive Exams/
JEE Main & Advanced/
Physics/
Laws of Motion and Friction/
Question 30263
JEE Physics · Medium

Laws of Motion and Friction: JEE — Maximum Friction MCQ

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

Timer-based practiceDetailed answer reviewMobile-friendly flow
JEE — Maximum FrictionMediumQuestion 30263

Question

A horizontal force F is gradually increased on a block (mass m, μₛ = 0.4, μₖ = 0.3, g = 10 m/s²). What happens when F just exceeds limiting friction?
  1. A
    Block decelerates
  2. B
    Block accelerates because now kinetic friction < limiting friction
    Correct
  3. C
    Block continues in static equilibrium
  4. D
    Block remains stationary

Correct answer

Block accelerates because now kinetic friction < limiting friction

Explanation

Just beyond limiting static friction (μₛmg), the block starts moving. Now only kinetic friction (μₖmg < μₛmg) acts, so net force = F − μₖmg > 0, causing acceleration.

Review Laws of Motion and Friction notesStart timed chapter practice