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Shared by EduAstra · 4/15/2026 · Physics

Explain Newton's laws of motion with PYQ patterns for JEE

Direct answer

Newton's three laws: (1) inertia — objects keep doing what they're doing unless a force acts; (2) F = ma — force changes momentum; (3) every action has an equal and opposite reaction.

Key points

  • 1Law 1 (Inertia): no net force ⇒ constant velocity (or rest). JEE traps: confusing 'no motion' with 'no acceleration'.
  • 2Law 2 (F=ma): valid only in inertial frames. Pseudo-forces appear in accelerating frames.
  • 3Law 3 (Action-Reaction): the pair acts on DIFFERENT bodies — never cancels.
  • 4Common JEE problems: pulleys, blocks on incline, lifts, friction at the threshold of slipping.

Sources

  • NCERT Class 11 Physics — Laws of Motion

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