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Saturday, 31 October

JEE Main · Physics · System of Particles and Rotational Motion

Kinetic Energy Loss in Rotational Coupling

JEE Main asked Kinetic Energy Loss in Rotational Coupling 5 times in 5 of the 108 shifts Lumi analysed, in 2020, 2021 and 2024. It belongs to Angular Momentum, in System of Particles and Rotational Motion (Physics). The longest wait between two years asking it was 3 years. In 2020 and 2024 it came in more than one shift of the same year.

Updated 2026-10-24

Times asked
5
in 5 shifts
Years
3 of 8
First asked
2020
last in 2024
Pattern
Comes in cycles
across the analysed shifts

Questions on this idea a shift, by year

2017–2026. Asked in 2020, 2021 and 2024. Years differ in how many shifts Lumi analysed, so each year is scaled to one shift of 25 Physics questions.

00.10.20’170.17’200.03’210’220’230.09’240’250’26

Raw count: 2017: 0 in 1 shift · 2020: 2 in 12 shifts · 2021: 1 in 24 shifts · 2022: 0 in 24 shifts · 2023: 0 in 12 shifts · 2024: 2 in 18 shifts · 2025: 0 in 8 shifts · 2026: 0 in 9 shifts.

Shift by shift

Each square is one analysed shift, in date order. Open a filled one for that paper.

  • 20260 of 9
  • 20250 of 8
  • 20242 of 18
  • 20230 of 12
  • 20220 of 24
  • 20211 of 24
  • 20202 of 12
  • 20170 of 1

Asked in that shift More than once Not asked

How JEE Main framed it

Numerical value is the usual form. Skill tested: calculation.

  • Kinetic energy loss when discs couple
  • Energy lost when disc is added

Difficulty

Easy 4Medium 1Hard 0

3 of the 5 questions had a numerical answer.

Every question

All 5 questions

From the official JEE Main shift papers, newest first. Open one for the full question, the options and the official answer.

  1. 30 Jan 2024, Shift 2 · Q52Two discs of moment of inertia I1=4 kg m2I_1 = 4\ kg\,m^2 and I2=2 kg m2I_2 = 2\ kg\,m^2, about their central axes & normal to their planes, rotating with…EasyNumerical value
  2. 30 Jan 2024, Shift 1 · Q52Consider a Disc of mass 5 kg, radius 2 m, rotating with angular velocity of 10 rad/s about an axis perpendicular to the plane of rotation.…EasyNumerical valueHas a figure
  3. 27 Aug 2021, Shift 2 · Q3Two discs have moments of intertia I1I_1 and I2I_2 about their respective axes perpendicular to the plane and passing through the centre.…EasySingle correct
  4. 4 Sep 2020, Shift 1 · Q22A circular disc of mass M and radius R is rotating about its axis with angular speed ω1\omega_1. If another stationary disc having radius…MediumNumerical value
  5. 2 Sep 2020, Shift 2 · Q4Two uniform circular discs are rotating independently in the same direction around their common axis passing through their centres. The…EasySingle correct

Shifts: 2 Sep 2020, Shift 2, 4 Sep 2020, Shift 1, 27 Aug 2021, Shift 2, 30 Jan 2024, Shift 2, 30 Jan 2024, Shift 1.

Same topic

Other ideas in Angular Momentum

Angular Momentum has 13 ideas JEE Main has asked; 8 of them came up in more than one question.

Topic analysisChapter analysisStudy this chapterAll repeated ideas