physical quantities | SI units | base units | derived units | class 11 physics | physics ka safar
Physics ka Safar・2 minutes read
The International System of Units (SI) standardizes physical quantities globally, with base units like meter, kilogram, and second. Derived units like velocity are calculated from base units and represented with specific combinations of magnitude and unit, such as meters per second or Newtons per meter squared.
Insights
- Physical quantities like length and time are considered base quantities, while emotions are not categorized as physical quantities due to their intangible nature.
- The International System of Units (SI) standardizes units globally, with base units like meter, kilogram, second, ampere, candela, and mole forming the foundation for measuring physical attributes, emphasizing the importance of both magnitude and unit for accurate representation.
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Recent questions
What are base quantities?
Attributes not derived from other physical quantities.
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Summary
00:00
Understanding Physical Quantities and Units in SI
- The discussion begins with Ethical Quantity, focusing on the International System of Units and physical quantities.
- Physical quantities are defined as measurable attributes like length or time, while emotions are not considered physical quantities.
- Base quantities are those that are not derived from any other physical quantity, such as length, time, temperature, current, light intensity, and amount of substance.
- Drive quantities are derived from base quantities, like speed being derived from distance and time.
- Units are essential for measuring physical quantities, requiring both magnitude and unit for accurate representation.
- The International System of Units (SI) was established in 1962 to standardize units globally, with base units like meter, kilogram, second, ampere, candela, and mole.
- Supplementary units are additional units beyond the base and drive quantities, to be discussed in a future lecture.
- The SI system defines specific units for various physical attributes, like meters for length, kilograms for mass, and seconds for time.
- Drive units are derived from base units, such as area being calculated by multiplying length and width.
- Velocity, for example, is calculated by dividing displacement by time, with units like meters per second representing the result.
16:11
Units of Velocity and Force in Physics
- The unit of velocity is meters per second, with the meter being the distance unit and the second being the time unit. This unit is also known as the meter per second (m/s) and is equivalent to one. Additionally, the unit of force is the Newton, with the area unit being meters squared and the pressure unit being Newtons per meter squared.
