📖 Comprehensive Note
Center of Gravity (CG) is the single point in a body through which the entire weight of the body appears to act. It is an important concept in understanding stability and balance.
The stability of an object depends on the position of its center of gravity:
- A lower CG makes an object more stable and harder to topple.
- A higher CG makes an object less stable and easier to tip over.
Everyday examples of stability include:
- A see-saw balances at the fulcrum when equal weights are placed on both sides.
- A pencil standing on its tip has a high CG and falls easily.
- Humans standing upright have their CG affecting balance and posture.
Understanding the CG and stability is important in designing structures, vehicles, and understanding human motion.
🎤 Lyrics
📊 Line-by-Line Study Guide
| Lyric Line | Meaning / Explanation |
|---|---|
| Leader: The center of gravity is a single point | Introduces CG as the single point where the entire weight of the object acts. |
| All: Through which all the weight is joint | Confirms that the total weight can be considered to act through this point for analysis. |
| Leader: Lower CG makes the object stable | Explains that objects with CG closer to the base are harder to topple. |
| All: Higher CG makes it easier to topple | Objects with CG far from the base are less stable and tip easily. |
| Leader: A see-saw balances at the fulcrum’s line | Example of equilibrium: a see-saw is balanced when the fulcrum divides it properly. |
| All: Equal weights make it fine | Equal weights on both sides of a pivot lead to perfect balance. |
| Leader: A pencil standing on its tip may fall | Objects with a very high CG are unstable and tip easily. |
| All: Humans standing upright feel it all | Human balance is affected by CG position; posture affects stability. |
💡 Mnemonic
To easily remember key points about Center of Gravity (CG) and stability:
Use the mnemonic: LHT – "Low Holds Tight"
- L – Lower CG makes objects stable
- H – Higher CG makes objects topple easily
- T – Tip examples: pencil tip, see-saw, human upright balance
This helps you quickly recall: the effect of CG on stability, examples of balance, and what makes objects tip over. Perfect for quick revision and exams.
❓ Quiz
1. What is the center of gravity?
2. How does a lower center of gravity affect stability?
3. What happens to an object with a higher center of gravity?
4. Which of these is an example of balance using CG?
5. What does the tip of a pencil standing upright demonstrate?
🃏 Flashcards
🎯 Drag & Drop
Drag the items into the correct category: Stable or Unstable.
📌 Summary
- The center of gravity (CG) is the single point through which the weight of an object acts.
- A lower CG makes an object more stable; a higher CG makes it easier to topple.
- Objects like a see-saw balance at the fulcrum when weights are equal.
- Objects with a high CG, like a pencil standing on its tip, are unstable.
- Humans standing upright experience stability due to proper weight distribution.
- Understanding CG helps in designing stable structures and predicting tipping points.