Friction — Predicted 2026

AI-Predicted Question Angles for UPSC 2026

Based on trend analysis, current affairs, and recurring themes in Friction.

Combined problems: Friction + Work-Energy Theorem

high

NEET frequently tests the integration of concepts. A common scenario involves calculating the work done by friction, or how friction affects the final velocity or stopping distance of an object, requiring the application of the work-energy theorem ($W_{net} = \Delta K$) or conservation of mechanical energy with non-conservative forces ($W_f = \Delta E_{mech}$). This tests a deeper understanding of energy transformation and the non-conservative nature of friction. For example, a block sliding down a rough incline and then moving on a rough horizontal surface until it stops.

Friction in systems with multiple blocks or pulleys

medium

Problems involving two blocks, one on top of another, where friction acts between both surfaces, or systems with pulleys and friction on one or more blocks, are challenging but fair game for NEET. These require careful drawing of multiple free-body diagrams, identifying action-reaction pairs, and solving simultaneous equations. The complexity arises from correctly identifying the direction of friction on each block and determining if one block slips relative to the other or if they move together.

Conceptual questions on the microscopic origin and limitations of friction models

low

While most NEET questions are quantitative, a conceptual question probing the microscopic causes of friction (asperities, adhesion) or the limitations of the simple $\mu N$ model (e.g., at very high speeds or very low normal forces) could appear. This would test a deeper theoretical understanding beyond rote formula application. Such questions are less frequent but can differentiate top performers.