Physical Quantities

Card 1: What are physical quantities?

Physical Quantities

  1. A physical quantity is a quantity that can be measured.
  2. A physical quantity can be divided into base quantity and derived quantity.
Card 2: What are base quantities?

Base Quantities

Base quantities are quantities that cannot be defined in term of other physical quantities.

Card 3: State the 5 base quantities and their SI unit

5 Base Quantites

Quantity Name of Unit Symbol of Unit
Length metre m
Time second s
Temperature Kelvin K
Mass kilogram kg
Current Ampere A
Card 4: What is derived quantities?

Derived Quantities

A derived quantity is a Physics quantity that is not a base quantity. It is the quantities which derived from the base quantities through multiplying and/or dividing them.

Derived Quantites

Card 5: What is derived unit?

Derived Unit

The derived unit is a combination of base units through multiplying and/or dividing them.

derived unit

Card 6: What are prefixes?


Prefixes are the preceding factor used to represent very small and very large physical quantities in SI units.

Prefixes Symbol Value
Tera T 1012
Giga G 109
Mega M 106
kilo k 103
desi d 10-1
centi c 10-2
mili m 10-3
micro µ 10-6
nano n 10-9
pico p 10-12
fento f 10-15
Card 7: What are scalar quantities?

Scalar Quantities

  1. Scalars are quantities which are fully described by a magnitude alone.
  2. Examples of scalar quantities are distance, speed, mass, volume, temperature, density and energy.
Card 8: What are vector quantities?

Vector Quantities

  1. Vectors are quantities which are fully described by both a magnitude and a direction.
  2. Examples of vector quantities are displacement, velocity, acceleration, force, momentum, and magnetic field.


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