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Questions and Answers
Which type of physical quantity consists of a magnitude and unit?
Which type of physical quantity consists of a magnitude and unit?
- Derived quantity
- Base quantity (correct)
- Unit quantity
- Fundamental quantity
What is an example of a fundamental unit?
What is an example of a fundamental unit?
- Pound
- Centimeter
- Newton (N)
- Kilogram (kg) (correct)
Which system of units uses foot, pound, and second as the base units for length, mass, and time respectively?
Which system of units uses foot, pound, and second as the base units for length, mass, and time respectively?
- CGS system
- MKS system
- SI system
- FPS system (correct)
What type of unit is the Newton (N)?
What type of unit is the Newton (N)?
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What sets the SI system apart from earlier systems like CGS and FPS?
What sets the SI system apart from earlier systems like CGS and FPS?
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Study Notes
Physical Quantities and Units
- A scalar physical quantity has only magnitude, whereas a vector physical quantity has both magnitude and direction.
- A physical quantity that consists of a magnitude and unit is called a measurable quantity.
Units
- A fundamental unit is a unit that cannot be expressed in simpler units, for example, meter (m) for length.
- The system of units that uses foot, pound, and second as the base units for length, mass, and time respectively is the Foot-Pound-Second (FPS) system.
Derived Units
- The Newton (N) is a derived unit, as it is derived from fundamental units, specifically, N = kg·m/s².
SI System
- What sets the SI (International System of Units) apart from earlier systems like CGS (Centi-Gram-Second) and FPS is that SI is a decimal-based system, making conversions easier and more logical.
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