Measurement

Question 1

Definition of Random Error (both graphical and theory)

Caused by imperfections of the user and affects precision

Answer 1

Derivations of the (measured value from the mean value), with varying signs and magnitude eg. parallax error

Data points are scattered on both sides of the best fit line, at varying perpendicular distances from the line

Question 2

How to reduce Random Error

Answer 2

Taking average of repeated readings

Question 3

Definition of systematic error (graphical and theory)

Caused by imperfections of the instruments like incorrect calibration and affects accuracy

Answer 3

Derivations of mean value from actual value, with same sign and magnitude eg. zero error

Best fit line when extrapolated does not pass through the origin of the graph

Question 4

How to ELIMINATE NOT reduce systematic error

Answer 4

calibrate the instrument against a known reliable instrument

Question 5

Accuracy meaning

Answer 5

degree of agreement between the result of the measurement and true value of the quantity

Question 6

Precision Meaning

Answer 6

degree of agreement of repeated measurements of the same quantity

Question 7

Vectors and Scalars

Answer 7

vectors are PHYSICAL quantities with both magnitude and direction while scalars are physical quantities with only magnitude but no direction

Question 8

please note

Answer 8

SF PLS (write in paper)

percentage uncertainty for x for eg (make x the subject FIRST then find)

A, m, s, Kg, Kelvin all base quantities not derived