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PHYSICAL QUANTITIES AND UNIT, Can be from a product of 2 vector quantities…
PHYSICAL QUANTITIES AND UNIT
SI UNIT
DERIVED UNITS
To deduce the base units, it s necessary to use the definition of the quantity.
The base units of physical quantities such as Newton (N), Joules (J) and Pascals (Pa) can be deduced.
Examples
Force
Energy
HOMOGENEITY
An equation is homogeneous if
quantities on both sides
of the equation has the
same unit.
HOMOGENEOUS
LHS = RHS
NON - HOMOGENEOUS
LHS ≠ RHS
Prefix table
Piko: 10^-12
Nano: 10^-9
Micro: 10^-6
Milli: 10^-3
Centi:10^-2
Desi:10^-1
Kilo: 10^3
Mega: 10^6
Giga: 10^9
Tera: 10^12
SI Unit
Amount of substance: mol
Temperature: K
mass: kg
length: m
time: s
current: A
PHYSICAL QUANTITIES
Have Magnitude
SCALAR QUANTITIES
no direction
time
power
speed
density
distance
mass
VECTOR QUANTITIES
has direction
force
acceleration
displacement
velocity
momentum
velocity
Qualitative
Based on creativity
Eg. Art & painting
Cannot be measure
Quantitative
Have unit and magnitude
eg. speed,length & time
Can be measured
Can be from a product of 2 vector quantities makes a scalar quantity
use + / - to differ the direction
