How To Plot Error Bars Physics
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The Arts Dance Film Music Theatre Visual Arts More Theory Of Knowledge Extended Essay Creativity Activity how to draw error bars by hand Service 1 Physics and physical measurementThe realm of physicsMeasurement & uncertaintiesVectors & scalars2 MechanicsKinematicsForces & dynamicsWork, energy & powerUniform circular motion4 Oscillations and wavesKinematics of simple how to draw error bars on a graph harmonic motion (SHM)Energy changes during simple harmonic motion (SHM)Forced oscillations & resonanceWave characteristicsWave properties Measurement and uncertainties1.2.1 State the fundamental units in the SI system.Many different types of measurements are made in physics. In order to provide a clear and concise set of data, a specific system of units is used across
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all sciences. This system is called the International System of Units (SI from the French "Système International d'unités"). The SI system is composed of seven fundamental units: Figure 1.2.1 - The fundamental SI units Quantity Unit name Unit symbol mass kilogram kg time second s length meter m temperature kelvin K Electric current ampere A Amount of substance mole mol Luminous intensity candela cd Note that the last unit, candela, is not used in the IB diploma program.1.2.2 Distinguish between fundamental and derived units and give examples of derived units.In order to express certain quantities we combine the SI base units to form new ones. For example, if we wanted to express a quantity of speed which is distance/time we write m/s (or, more correctly m s-1). For some quantities, we combine the same unit twice or more, for example, to measure area which is length x width we write m2. Certain combinations or S
and shows the uncertainty in that measurement. In the example shown below (Figure 1) we how to calculate error bars will assume that only quantity A has an uncertainty and that this how to draw error bars on a line graph is +/- 1. For example the reading of A for B = 6 is given as 38.4 but
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because of the uncertainty actually lies somewhere between 37.4 and 39.4.The line of gradient m is the best-fit line to the points where the two extremes m1 and m2 http://ibguides.com/physics/notes/measurement-and-uncertainties show the maximum and minimum possible gradients that still lie through the error bars of all the points. The percentage uncertainty in the gradient is given by [m1-m2/m =[Δm/m]x100% In the example m1 = [43.2-30.8]/10 = 1.24 and m2 = [41.7-32.7]/10 = 0.90.The slope of the best fit line (m) = [42.4-31.8]/10 = 1.06In the example the uncertainty is [1.24-0.90]/1.06 http://www.schoolphysics.co.uk/age16-19/General/text/Uncertainties_in_graphs/index.html = 32%Alternatively the value of the gradient can be written as 1.06 +/-0.17 If the lines are used to measure an intercept (in this case on the Y (quantity A) axis) then there will be an uncertainty in this value also.For the line of gradient m the intercept is 31.8For the line of gradient m1 it is 30.8 and for the line of gradient m2 it is 32.7.So the value for the intercept could be quoted as 31.8 +/-1.0.If there is an uncertainty in both the quantities A and B then instead of an error bar you would have an error rectangle. The maximum and minimum gradient lines should pass through the error rectangle for each point on the graph (see Figure 2). N.B the comments in this section about uncertainty and errors apply to a curve as well as a straight line graph although of course the gradient of the graph would vary along the curve. A VERSION IN WORD IS AVAILABLE ON THE SCHOOLPHYSICS CD Top of page © Keith Gibbs 2016
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