![Physical Quantity
The quantity which can be measured by some physical means.
Example : Length, Weight
Note:
Love is not a physical quantity
Physical quantities obey physical laws. They are measurable.
Measurement of Physical quantity = Magnitude x unit [in which the quantity is measured]
Numerical value x unit
n x u
Length of a stick = 20 m
Here the unit of length is meter which is 20 times in its length](https://image.slidesharecdn.com/2physicalquantity2-210526115938/85/Physical-Quantities-Part-2-4-320.jpg)
![1000 g = 1 kg
[M] [M]](https://image.slidesharecdn.com/2physicalquantity2-210526115938/85/Physical-Quantities-Part-2-46-320.jpg)
Physical Quantities Part 2
- 1. TIPS FOR TAKING ONLINE CLASS FOR YOURSELF 1: Be ready before the starting time 2: Treat an online course like a real course 3: Hold yourself accountable 4: Practice time management 5: Create a regular study space and stay organized 6: Eliminate distractions 7: Figure out how you learn best 8: Actively participate 9: Leverage your network INSIDE THE CLASS 1: Open your camera 2: Mute your audio 3: take your pen, copy and other material sources 3: Don’t add your note on the screen 4: Do ask, write and share after the permission. It will be provided at the end of the class 5: Be more disciplined. 1
- 2. This is a REGULAR CLASS. Please make a note by writing down what you have seen here. Make a separate note for CURRENT ELECTRICITY.
- 3. UDAY KHANAL Department of Physics CCRC 3
- 4. Physical Quantity The quantity which can be measured by some physical means. Example : Length, Weight Note: Love is not a physical quantity Physical quantities obey physical laws. They are measurable. Measurement of Physical quantity = Magnitude x unit [in which the quantity is measured] Numerical value x unit n x u Length of a stick = 20 m Here the unit of length is meter which is 20 times in its length
- 5. The product of each numerical value and its corresponding unit is constant:
- 9. Fundamental unit in different system of measurement: S.No. Quantity Unit Abbreviation S.No. Quantity Unit Abbreviation
- 10. S.No. Quantity Unit Abbreviation S.No. Quantity Unit Abbreviation
- 11. S.No. Quantity Unit Abbreviation
- 12. SI System (International System of Units) This system is result of CGPM meeting in 1971. Now-a-days this system is popular throughout the world
- 13. Definition of fundamental units:
- 14. Supplementary Unit: The unit having no dimensions is supplementary unit. e.g., Plane angle Radian Solid angle Steradian Kg.m/s2
- 15. S.No. Practical unit of Length Practical Unit of Mass Practical Unit of Time Practical Unit: A large number of units are used in general life for measurement of different quantities in comfortable manner. But they are neither fundamental units nor derived units. Some practical units are listed below.
- 16. Factors Prefix Symbol Some measurement are listed below: Prefix for SI Units:
- 17. Measurements Length in meter
- 18. Measurements Time interval in seconds
- 19. Object Mass in Kilogram
- 20. Dimensions and Dimensional Formula
- 22. Methods for finding Dimensional Formulae Example: Find the dimensional formula for momentum
- 25. Some Workout
- 26. Some examples of derived physical quantities S.No Physical Quantity Relation with other physical quantities Dimensional formula SI Unit
- 34. A) To check the correctness of a physical equations:
- 37. Example 1:
- 42. B) To derive new relation among physical quantities: Homogeneity principle of dimensions is a powerful tool to establish the relation among various physical quantities.
- 43. Combining; Tα lagb T = K lagb
- 44. If centripetal force is a function of ‘m’ , ‘v’ and ‘r’ then find the relation:
- 45. C) To convert a physical quantity from one system to another:
- 46. 1000 g = 1 kg [M] [M]
- 54. Measured value Number of significant figures Rule
- 67. Error Analysis
- 73. Note:
- 88. The essence of SCIENCE: ask an impertinent question, and you are on the way to a pertinent answer.
- 89. DID YOU ENJOYE THE CLASS? Leave your valuable suggestions so that I will be better for you all in the next class. Your suggestions are highly appreciated. NO? Yes?