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1.1 Physical Quantities and Measurements

Absolutely! Let’s make it super clean, well-formatted, visually appealing, with headings, emojis, and real-world examples — perfect for a 9th-grade physics note. 😄

🟢 Chapter 1: Physical Quantities and Measurement

Physics is the study of matter, energy, and how they interact. To understand the world, we need to measure physical quantities accurately.

🔹 1. Physical Quantities

A physical quantity is anything that can be measured or calculated.

Examples:

• Length 📏

• Mass ⚖️

• Time ⏰

• Temperature 🌡️

• Speed 🚗

• Force 🪑

• Energy 💡

Types of Physical Quantities 1️⃣ Fundamental (Basic) Quantities

These cannot be defined using other quantities.

Quantity Symbol Unit Real-World Example

                  asdf asdf              

2️⃣ Derived Quantities

These are calculated using fundamental quantities.

Quantity Formula Unit Real-World Example

Speed (v = \frac{Length}{Time}) m/s Car moving on road 🚗 Force (F = Mass × Acceleration) newton (N) Pushing a table 🪑 Pressure (P = \frac{Force}{Area}) pascal (Pa) Air in a balloon 🎈 Energy (E = Force × Distance) joule (J) Lifting a bucket of water 💧

🔹 2. Measurement

Measurement is the process of comparing a quantity with a standard unit.

Instruments used:

• Length → meter scale, vernier caliper 📏

• Mass → balance ⚖️

• Time → stopwatch ⏱️

• Temperature → thermometer 🌡️

🔹 3. Importance of Measurement

✅ Helps describe the physical world clearly 🌍
✅ Ensures accuracy and comparison 📊
✅ Basis for scientific experiments and calculations 🔬

═══════════════════════════════════════════════
  QUANTITY    |   UNIT    |  SYMBOL  |  EXAMPLE
═══════════════════════════════════════════════
  Length 📏   |   meter   |    m     |  Door = 2m
───────────────────────────────────────────────
  Mass ⚖️     | kilogram  |    kg    |  Bag = 1kg
───────────────────────────────────────────────
  Time ⏰     |  second   |    s     |  Song = 180s
═══════════════════════════════════════════════