🌟 Physics Notes: Laws of Motion (Class 9 & 10 Easy Revision)

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 πŸ”· What are Newton’s Laws of Motion?

Sir Isaac Newton gave three laws of motion that explain how objects move.

✅ 1. First Law (Law of Inertia)

πŸ‘‰ Statement: An object stays at rest or keeps moving in a straight line unless an external force acts on it.

✔️ Easy Meaning:
If you don’t push or pull something, it will stay where it is or keep moving the same way.

✔️ Example:
A book on a table stays there until someone lifts it.

✅ 2. Second Law (Law of Force and Acceleration)

πŸ‘‰ Statement: Force = mass × acceleration
(F = m × a)

✔️ Easy Meaning:
If you apply more force to an object, it accelerates more. Heavy objects need more force to move.

✔️ Example:
Pushing an empty cart is easier than pushing a full cart.

✅ 3. Third Law (Action-Reaction Law)

πŸ‘‰ Statement: For every action, there is an equal and opposite reaction.

✔️ Easy Meaning:
If you push something, it pushes back with equal force in the opposite direction.

✔️ Example:
When you jump off a boat, the boat moves backwards.

πŸ”· Units to Remember

✅ Force: Newton (N)
✅ Mass: Kilogram (kg)
✅ Acceleration: m/s²

πŸ”· Easy Tip

πŸ“Œ First Law: “Things stay same unless pushed.”
πŸ“Œ Second Law: “Force makes things move faster.”
πŸ“Œ Third Law: “Push back with same force.”

✅ Final Words

Revise these three laws with their formulas and examples daily. They are important for MCQs, short questions, and numericals in your Physics exam.

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