Units

Question 1

SI units

Answer 1

Used to standardise quantities used to measure physical properties including time, lengths, depth, mass, time, and energy. SI units help us communicate in a consistent universal way.

Question 2

Common SI units

Answer 2

Length metre m
Mass kilogram kg
Time second s
Electric current ampere A
Temperature kelvin K
Amount of substance mole mol
Luminous intensity candela cd

Question 3

Derived quantities

Answer 3

combinations of SI units for example;
Speed = metre per second = m/s

Question 4

Prefixes

Answer 4

Extremely large or extremely small numbers

Question 5

Common prefixes

Answer 5

Giga G 10^9
Mega 10^6
Kilo 10^3
Centi 10^-2
Milli 10^-3
Micro 10^-6
Nano 10^-9

Question 6

Scientific notation

Answer 6

expressing number to the power of 10
for example;
1,000 = 1x10^3
3,000 = 3 x10^3
40,000 = 4 x 10^4

Question 7

Combining units with scientific notation

Answer 7

Every answer you give in physics needs units
The speed of light = 3.00 x 10^8 m/s