Topic A- Mechanics (quantities )

Question 1

What are quantities?

Answer 1

physical quantities that can be measured are called quantities.

Question 2

What is the illustration of SI units?

Answer 2

international system of units

Question 3

how many base units are accepted by SI?

Answer 3

7 base units

Question 4

what are the 7 base units?(with unit name and symbol)

Answer 4

Mass (kilogram kg)
time (second s)
length (meter m)
electric current (Ampere A)
temperature ( Kelvin K)
amount of substance (mole mol)
light intensity (candela cd )

Question 5

what are base units?

Answer 5

base units are the the 7 main units accepted by the SI, in which all other units are based.

Question 6

what are derived units?

Answer 6

derived units are units that can be built using base units.

Question 7

what is a prefix?

Answer 7

prefix is used to make a unit larger or smaller.

Question 8

recall the example prefixes we studied said to be important.

Answer 8

kilo 10^3
mega 10^6
giga 10^9

centi 10^-2
milli 10^-3
micro 10^-6
nano 10^-9