Laws of Motion (Concept + Examples) – Physics 2026

The Laws of Motion given by Sir Isaac Newton are the foundation of Mechanics. From walking and driving to rockets and satellites — everything follows Newton’s Laws.

At CHEMASH, we teach this chapter deeply with concept clarity + numericals for Class 9–12, JEE & NEET 2026.

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Table of Contents

• First Law of Motion
• Second Law of Motion
• Third Law of Motion
• Free Body Diagram
• Friction
• Solved Numericals
• MCQs
• FAQs
• Why CHEMASH?

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1️⃣ Newton’s First Law (Law of Inertia)

“A body remains at rest or in uniform motion unless acted upon by an external force.”

Example:

• Passengers jerk forward when bus suddenly stops.
• Coin falls into glass when card is flicked.

Defines Inertia (resistance to change in motion).

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2️⃣ Newton’s Second Law

Force = Rate of change of momentum
Mathematically: F = ma

Unit of Force = Newton (N) Dimension = [MLT⁻²]

Important for JEE & NEET numericals.

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3️⃣ Newton’s Third Law

“For every action, there is an equal and opposite reaction.”

Examples:

• Recoil of gun
• Rocket propulsion
• Walking

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4️⃣ Free Body Diagram (FBD)

A Free Body Diagram shows all forces acting on a body.

Steps to draw FBD:

• Isolate the object
• Draw all forces (Weight, Normal, Friction, Tension)
• Resolve forces into components if needed

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5️⃣ Friction

Friction opposes motion.

Formula: f = μN Where μ = coefficient of friction

Types:

• Static Friction
• Kinetic Friction
• Rolling Friction

Motion in One Dimension – CHEMASH

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6️⃣ Solved Numerical

Q: A 5 kg object accelerates at 2 m/s². Find force.

F = ma = 5 × 2 = 10 N

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7️⃣ MCQs (Exam Oriented)

1. If net force on a body is zero, it must: A) Be at rest B) Be moving C) Have constant velocity ✔ D) Accelerate

Explanation: Zero net force means zero acceleration → constant velocity.

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8️⃣ Frequently Asked Questions

Is Laws of Motion important for Boards 2026?
Yes, it carries high weightage in theory and numericals.

Does CHEMASH provide problem-solving sessions?
Yes. We focus on concept clarity + exam-level numericals.

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Why Study Laws of Motion with CHEMASH?

• Low-budget tuition for all classes
• Experienced & friendly teachers
• Strong numerical practice
• Trusted brand by students & parents
• JEE + NEET + Boards preparation

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Newton’s Laws – Physics Classroom