A-LEVEL Physics: 1.2.2: Calculating Uncertainties (SaveMyExams) Flashcards
There is Always a Degree of ___ when Measurements are Taken.
Uncertainty.
Uncertainty Can be Thought of as the Difference Between…
The Measurement Reading Taken & the True Value.
What is ‘Absolute Uncertainty’?
Absolute Uncertainty is Uncertainty Given as a Fixed Quantity.
What is ‘Fractional Uncertainty’?
Fractional Uncertainty is Uncertainty Given as a Fraction of the Measurement.
What is ‘Percentage Uncertainty’?
Percentage Uncertainty is Uncertainty Given as a Percentage of the Measurement.
How do you Find the Uncertainty of a Reading?
+_ Half the Smallest Division.
eg if Resolution of Instrument is 1mm, then the Uncertainty of the Reading will be +_0.5mm
How do you Find the Uncertainty in a Measurement?
At Least +_ Smallest Division.
How do you Find the Uncertainty in Repeated Data?
+_ Half the Range
(ie +_ 1/2 Largest Value - Smallest Value)
Absolute & Percentage Uncertainty Should Always be Given to the Same Number of ___ ___ as the ___.
Significant Figures, Reading.
What do you do with the Uncertainty when you Add Data?
Add Together the Absolute Uncertainties.
What do you do with the Uncertainty when you Multiply Data?
Add the Percentage or Fractional Uncertainties.
What do you do with the Uncertainty when you Raise the Data to a Power?
Multiply the Percentage Uncertainty by the Power.
