Physics
Newton's Laws of Motion Made Simple
By Dr. Sandhya Classes Editorial Team · Published 2026-10-03 · Updated 2026-10-03 · 3 min read
Understand Newton's three laws, free-body diagrams and common misconceptions in Class 11 Mechanics.
Physics at Dr. Sandhya Classes is taught personally by Dr. Sandhya, Ph.D. in Physics, teaching since 2015 — offline in Zirakpur (Highland Marg & Lohgarh Road) and online across India. About Dr. Sandhya
The first law and inertia
An object keeps its state of rest or uniform motion unless a net external force acts. The key word is 'net'.
The second law as a tool
F = ma connects forces to motion. Apply it separately along chosen axes after drawing a free-body diagram.
The third law and pairs
Action and reaction act on different bodies, so they never cancel each other in a single free-body diagram.
Common misconceptions
Motion does not require a force; change in motion does. Normal force is not always equal to weight.
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