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Measurement and Experimentation — PHYSICS STD 9 — Question

ICSE BoardEnglish MediumSTD 9PHYSICSMeasurement and Experimentation3 Marks
Question
(a) What do you understand by the term constant of proportionality?
(b) How can proportionality constant be determined from the best fit straight line graph?
✓

Answer

(a) Constant of proportionality : If a quantity say X is directly proportional to another quantity Y , then X is written as $X = KY$, where K is called constant of proportionality.
(b) Constant of proportionality : can be determined from the best fit straight line by calculating the slope of graph by using the formula. Slope of graph
Difference between the co-ordinates on $y$-axis
$
=\frac{\text { for any two points on the graph line }}{\text { Difference between the co-ordinates on } x-a x i s}
$
for any two points on the graph line

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