Collisions — Predicted 2026

AI-Predicted Question Angles for UPSC 2026

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

2D Elastic Collision with Specific Angles

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While 1D collisions are more common, NEET could introduce a 2D elastic collision where one object is initially at rest and the other strikes it, with specific angles given for the final velocities. This would test the vector nature of momentum conservation (x and y components) and kinetic energy conservation simultaneously. Students would need to solve a system of equations, which is more involved than 1D problems. The complexity would likely be managed by providing simple angles (e.g., 30, 45, 60, 90 degrees) or asking for a specific component.

Collision Involving Springs or Potential Energy

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A collision problem could be combined with the concept of elastic potential energy stored in a spring. For instance, two blocks collide, and one compresses a spring attached to a wall. This would require applying momentum conservation during the collision (if inelastic) and then energy conservation (kinetic to spring potential) for the subsequent motion. This tests the integration of collision dynamics with work-energy principles, a common theme in NEET physics.

Energy Loss Calculation in Inelastic Collisions

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Calculating the percentage or absolute amount of kinetic energy lost in an inelastic or perfectly inelastic collision is a recurring and important concept. NEET often asks for the fraction of kinetic energy lost. This requires calculating initial and final kinetic energies after determining final velocities using momentum conservation. It directly tests the understanding that kinetic energy is not conserved in inelastic collisions and the ability to quantify that loss.