📘 CET Physics – Laws of Motion (Chapter Summary) By Sarthak Patil

 🔹 Introduction:


Laws of Motion हे CET आणि NEET साठी अत्यंत महत्त्वाचं chapter आहे. Newton चे तीन नियम, force, inertia, friction हे concept समजून घेतले की problem-solving सोपी होते.

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📚 Newton's Laws of Motion:


1️⃣ First Law (Law of Inertia):

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

👉 Formula: No net force ⇒ No acceleration

👉 Example: Seatbelt effect in moving car.


2️⃣ Second Law:

“The rate of change of momentum is directly proportional to the applied force.”

👉 Formula: F = ma

👉 Units: Newton (N) = kg·m/s²


3️⃣ Third Law:

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

👉 Example: Recoil of gun, walking

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🧲 Types of Forces:


Contact Forces: Friction, Normal, Tension


Non-contact Forces: Gravitational, Magnetic, Electrostatic


Spring Force: F = –kx


Friction Force: f = μN

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🛞 Circular Motion:


Centripetal Force: F = mv²/r


Acts towards the center


Example: Vehicle on curved road

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⚡ Important Formulas:


Concept Formula


Force F = ma

Weight W = mg

Momentum p = mv

Impulse I = F × Δt = Δp

Friction f = μN

Tension Depends on situation (pulley, hanging mass)

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💡 Quick Tips:


Units लक्षात ठेवा: N, kg·m/s²


Vectors मधे direction महत्त्वाचं!


Free-body diagrams खूप उपयुक्त


Numerical practice = concept clarity

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🔚 Conclusion:


Laws of Motion म्हणजे physics ची base. जर हा chapter नीट केला, तर पुढचे chapters जसं की Work, Energy, Power, Circular Motion सहज समजतात.


📌 दररोज थोडं revision ठेवा आणि Formula sheet सोबत short tricks revise करा.

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