Physics OCR B A Level Module 2: Fundamental Data Analysis: Questions with Complete Solutions

What is an uncertainty? An uncertainty in a measurement is anything that may cause the value to differ from the true value. What is the resolution of a measuring instrument? The resolution of an instrument is the smallest increment that produces a noticeable change in the value. How do you combine uncertainties when adding values? Add the absolute uncertainties. How do you combine uncertainties when subtracting values? Add the absolute uncertainties. How do you combine uncertainties when multiplying values? Add the percentage uncertainties. How do you combine uncertainties when dividing values? Add the percentage uncertainties. How do you combine uncertainties when raising values to powers? Multiply the percentage uncertainty by the power. How do you calculate percentage uncertainty? Percentage Uncertainty = (Uncertainty/Measurement) x 100%