Physical Quantities & Units Flashcards
1
Q
What is a Physical Quantity
A
A quantity that can be measured or calculated and has a unit
2
Q
What are the two types of Quantities
A
Base Quantities and Derived Quantities
3
Q
List all the Base Quantities and their Units
A
- Mass (Kilogram)
- Length (Metre)
- Temperature (Kelvin)
- Current (Ampere)
- Time (Second)
- Luminous Intensity (Candela)
- Mole (Mol)
4
Q
What is a Derived Quantity
A
A quantity obtained by either multiplying or dividing base quantites
5
Q
List 5 examples of Derived Quantites and their units in terms of Base Units
A
- Area (m2)
- Voltage (kg m2 s-3 A -1)
- Acceleration (m s-2)
- Energy (kg m2 s-2)
- Power (kg m2 s-3)
6
Q
Examples of Prefixes of Quantities
A
- Deci - 10^1 - Centi - 10^-2
- Kilo - 10^3 - Milli - 10^-3
- Mega - 10^6 - Micro - 10^-6
- Giga - 10^9 - Nano - 10^-9
- Tera - 10^12 - Pico - 10^-12
7
Q
What is a Scalar Quantity
A
A quantity defined by only magnitude
8
Q
What is a Vector Quantity
A
A quantity defined by both magnitude and direction
9
Q
Examples of Scalar Quantities
A
- Distance - Temperature
- Mass - Current
- Speed - Length
- Time - Power
10
Q
Examples of Vector Quantites
A
- Momentum - Velocity
- Acceleration - Displacement
- Force - Gravity Field Strength
- Electric F.S - Magnetic F.S
11
Q
What is a Resultant of Vectors
A
A single vector that represents the effect of all vectors acting at a point/on a body
