Physical Quantities Flashcards
what are the basic quantities?
-length
-current
-mass
-time
-temperature
LCMTT
what is the si unit of length?
metre (m)
what is the si unit of current?
ampere (A)
what is the si unit of mass?
kilogram (kg)
what is the si unit of time?
seconds (s)
what is the si unit of temperature?
kelvin (k)
what are some examples of derived quantities?
- density
- volume
- speed
- force
- pressure
- electrical energy
what is the symbol and factor of the prefix mili?
symbol - m
factor - x10-3
what is the symbol and factor of the prefix micro?
symbol - upside down h
factor - x10-6
what is the symbol and factor of the prefix nano?
symbol - n
factor - x10-9
what is the symbol and factor of the prefix pico?
symbol - p
factor - x10-12
what is the symbol and factor of the prefix kilo?
symbol - k
factor - x10 3
what is the symbol and factor of the prefix mega?
symbol - M
factor - x10 6
what is the symbol and factor of the prefix giga?
symbol - G
factor - x10 9
what is the symbol and factor of the prefix tera?
symbol - T
factor - x10 12
what can vernier caliper be used for?
to measure external and internal diameter as well as depth
what is the micrometer screw gauge used for?
to measure the thickness of a coin or diameter of wire
what is a period?
it is the time taken for one complete oscillation
what is the si unit for period?
seconds (s)
how does the length of the string affect the period?
the longer the string, the longer the period
the shorter the string, the shorter the period
does the mass of the bob affect the period?
no, the mass of the bob does not affect the period
what are some precautions for the pendulum experiment?
- start timing when oscillations are stable
- use small angle of displacement
- repeat the experiment at least once and use the average time to calculate period of oscillation
- use the retort stand as an aid of fudicial line to ensure stopwatch is start and stop accurately at the right position
define scalar quantities
a scalar quantity has only magnitude but no direction
define vector quantities
a vector quantity has both magnitude and direction
what is the approximate size of an atom?
1x10 -10m
what is the approximate size of the earth?
6371km in radius, about 1x10 7m in size