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Questions and Answers
What is the purpose of measurement in physics?
What is the purpose of measurement in physics?
- To create new physical quantities not previously defined
- To express physical quantities without a standard
- To limit the number of units used in physical expressions
- To compare physical quantities with arbitrary reference standards (correct)
Which of the following correctly identifies a base unit within the SI system?
Which of the following correctly identifies a base unit within the SI system?
- Ampere for power
- Joule for energy
- Newton for force
- Meter for length (correct)
What distinguishes derived units from base units?
What distinguishes derived units from base units?
- Derived units are formed from base units (correct)
- Derived units are not standardized
- Derived units cannot be expressed without conversion
- Derived units are always smaller than base units
What was the primary reason for adopting the SI system?
What was the primary reason for adopting the SI system?
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Which unit of measurement is associated with the FPS system?
Which unit of measurement is associated with the FPS system?
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Study Notes
###Â Introduction to Measurement
- Measuring physical quantities involves comparing them to a standard reference.
- The result is expressed as a number with a unit.
- Units for fundamental quantities are called base units.
- Units for derived quantities are called derived units.
- A system of units is a complete set of units.
###Â International System of Units (SI)
- The SI system is the internationally accepted system of units.
- Traditionally, scientists used different systems like CGS, FPS, and MKS.
- CGS stands for centimeter, gram, second.
- FPS stands for foot, pound, second.
- MKS stands for metre, kilogram, second.
- The SI system was developed by the Bureau International des Poids et Mesures (BIPM).
- The SI system was revised in November 2018.
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