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Saturday, 31 October

JEE Main 2021 · PhysicsNumerical answerNumerical valueMediumCalculation

JEE Main 17 March 2021, Shift 1, Physics Q30

Question 30 of 90 in this shift, Physics question 30 of 30, Section B.

Two blocks (m = 0.5 kg and M = 4.5 kg) are arranged on a horizontal frictionless table as shown in figure. The coefficient of static friction between the two blocks is 37\frac{3}{7}. Then the maximum horizontal force that can be applied on the larger block so that the blocks move together is __________ N. (Round off to the Nearest Integer) [Take g as 9.8 ms−2^{-2}]

The figure, in words

A small block m resting on top of a larger block M, which sits on a horizontal hatched surface (table); an arrow labelled F points horizontally to the right from the side of the larger block M.

Official answer

21

NTA final key.

Chapter
Laws of Motion
Topic
Friction
Idea tested
Two-Block Friction Systems

Same idea in other shifts

Asked 3× in all
  1. 27 Jun 2022, Shift 1 · Q34A system of two blocks of masses m=2m=2 kg and M=8M=8 kg is placed on a smooth table as shown in figure. The coefficient of static friction…MediumSingle correctHas a figure
  2. 26 Aug 2021, Shift 2 · Q21The coefficient of static friction between two blocks is 0.5 and the table is smooth. The maximum horizontal force that can be applied to…MediumNumerical valueHas a figure

Question text from the official JEE Main paper published by NTA; answer from the final answer key. Chapter, topic and idea tags, difficulty and skill are Lumi’s. This question needs a figure we do not reproduce; it is described in words above. Lumi analyses 108 of the 174 JEE Main shifts held from 2017 to 2026.