Graphical uncertainties

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Presentation transcript:

Graphical uncertainties Advanced Higher Physics Investigation Graphical uncertainties gradients intercepts

Parallelogram method Advanced Higher Physics Investigation draw the axes and plot all points without using uncertainty bars

Advanced Higher Physics Investigation calculate the centroid, or the midpoint, for both the x and y values use the formula

Advanced Higher Physics Investigation draw the line of best fit through the centroid with an approximately equal scatter of points on either side of the line the best estimates of the gradient and the intercept of this line can be determined

Advanced Higher Physics Investigation draw vertical lines through the largest and smallest x values

Advanced Higher Physics Investigation draw two lines parallel to the line of best fit, one through the point most above the line of best fit and one through the point most below the line of best fit, this forms a parallelogram surrounding all of the points

Advanced Higher Physics Investigation draw in the diagonals of the parallelogram the gradients of these lines are used to calculate the uncertainty in the gradient Dm using

Advanced Higher Physics Investigation the diagonals give two other intercepts, chigh and clow the uncertainty in the intercept Dc is then calculated using

Example Advanced Higher Physics Investigation use the following data points to practise the parallelogram method: (2,1), (3,2), (4,1.6), (5, 2.4), (6,3), (7,4), (8,4), (9,5), (10,4.6), (11,6), (12,7)

Advanced Higher Physics Investigation

Advanced Higher Physics Investigation answers:

Two thirds of uncertainty bars method Advanced Higher Physics Investigation Two thirds of uncertainty bars method draw the axes and plot all points using uncertainty bars

Advanced Higher Physics Investigation draw a line of best fit through about two thirds of the uncertainty bars with an approximately equal scatter of points on either side of the line

Advanced Higher Physics Investigation draw two “worst” lines of best fit through about two thirds of the uncertainty bars

Advanced Higher Physics Investigation calculate the uncertainty in the gradient using giving the gradient value m ± Dm mhigh m mlow

Advanced Higher Physics Investigation calculate the uncertainty in the intercept using giving the gradient value c ± Dc chigh c clow

Example Advanced Higher Physics Investigation use the following data points to practise the parallelogram method, all points have a y uncertainty of ±0.5 and a negligible x uncertainty: (2,1), (3,2), (4,1.6), (5, 2.4), (6,3), (7,4), (8,4), (9,5), (10,4.6), (11,6), (12,7)

Advanced Higher Physics Investigation

Advanced Higher Physics Investigation answers:

Advanced Higher Physics Investigation