measurement Flashcards
what is physics
physics is the study of matter and energy and the interaction between the two.
definition of physical quantities
A physical quantity is a quantity that can be measured.
It consists of a numerical magnitude and a unit.
definition of base quantities
Base quantities are a set of independent
physical quantities.
what are the SI units of base quantities called
base units
what are the SI units of base quantities called
base units
suitable magnitudes of measurement for tape measure
a few metres
suitable magnitudes of measurement for metre ruler
several centimetres
suitable magnitudes of measurement for vernier calipers
a few centimetres
suitable magnitudes of measurement for micrometer screw gauge
a few millimetres
what is the precision of an instrument
The precision of an instrument is the smallest unit that
the instrument can measure.
what is the precision of an instrument
The precision of an instrument is the smallest unit that
the instrument can measure.
how to avoid parallax errors
position your eyes such that your kine if sight is perpendicular to the ruler.
how to reduce random error
Repeat the measurement
and take the average value of the measurements.
how to correct zero error
The 0 cm mark on the ruler may not be exactly at the end of the ruler.
Avoid using the zero mark as a start point to take measurements. This is because wear and tear may make it unsuitable for measuring purposes.
precaution whilst using tape measure
Ensure that the tape is not slack or twisted.
