A-LEVEL Physics: 1.2.3: Determining Uncertainties from Graphs (SaveMyExams)

Question 1

The Uncertainty in a Measurement Can be Shown on a Graph as a…

Answer 1

Error Bar.

Question 2

How are ‘Error Bars’ Drawn on Graphs to Represent Uncertainties?

Answer 2

The Error Bar is Drawn Above & Below the Point (or from Side to Side), & Shows the Uncertainty in that Measurement.

Question 3

Error Bars are Plotted on Graphs to Show the ___ ___ of Values Plotted.

Answer 3

Absolute Uncertainty.

Question 4

How do Calculate the Uncertainty in a Gradient on a Graph?

Answer 4

Draw the Steepest Line of Best Fit & the Shallowest Line of Best Fit, which Cross Through All Error Bars. Then, Calculate the Gradient of Both those Lines of Best Fit. Those are your Uncertainties.

Question 5

How do you Calculate the Percentage Uncertainty in the Gradient of a Graph?

Answer 5

Percentage Uncertainty = Steepest Gradient - Shallowest Gradient / Steepest Gradient (*100%)