IBDP Physics - Mathematics and Measurements

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10 Terms

1
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Orders of Magnitude

Expressing numbers using powers of ten to represent a range of magnitudes in physics.

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Uncertainties

Estimates of the difference between a measurement reading and the true value, caused by random or systemic errors.

3
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Types of Uncertainties

Absolute uncertainty (fixed quantity), fractional uncertainty (fraction of total measurement), percentage uncertainty (percentage of total measurement).

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Combining Uncertainties

Addition/subtraction (sum of absolute uncertainties), multiplication/division (sum of fractional uncertainties), power (magnitude of n times fractional uncertainty).

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Scalars and Vectors

Scalars have magnitude, vectors have magnitude and direction. Distance is scalar, displacement is vector.

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Vectors Representation

Vectors are represented by arrows, where the arrowhead shows direction and length indicates magnitude.

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Combining Vectors

Combine vectors head to tail and use Pythagoras’ Theorem to find the resultant magnitude.

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Error Bars

Represent uncertainty in measurements on graphs with vertical and horizontal bars at each point.

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Lines of Best-Fit

Drawn to minimize distance between points and the line, with some points above and some below.

10
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Uncertainty in Gradient

Calculated as ΔK = (kmax - kmin)/2, where k is the gradient and ΔK is the uncertainty in the gradient.