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Measurement and Uncertainty • Physics is a quantitative, experimental science. To do physics, one has to make measurements. • Every measurement has an uncertainty; no measuring 3 instrument is perfect. • Uncertainty may be written explicitly, e.g., height of a table = 72.3±0.1 cm
PHYSICS is a science of measurement. The things which are measured are called physical quantities which are defined by the describing how they are to be measured. There are three fundamental quantities in mechanics: Length Mass Time. All other physical quantities combinations of these three basic quantities. 2.
Measurement of length and time. Vernier Callipers. A pair of vernier callipers can be used to measure the thickness of solids and the external diameter of an object by using the external jaws. The internal jaws of the calliper are used to measure the internal diameter of an object.
Measures of Science: a measurement is a comparison between an unknown quantity and a standard. to be considered valid, the measuring device must be compared against a widely held standard. the standard must be readily available, reproducible and constant over time.
understanding of the nature of measurement and uncertainty. In addition, the coherence of the approach will foreground the central role of experiment in physics and the interplay between scientific inferences based on data and theory. AB, MSA, FEL, RMC November 2002 Please inform the authors before using these materials in any teaching situation.
4 Αυγ 2022 · Chapter 1. Measurement. Section 1.1. Measuring Things, Including Lengths. Note. Measurements of physical quantities are a basic part of physics. Quantities measured in physics include length, time, mass, speed, temperature, force, pressure, work, energy, electrical current, resistance, and capacitance.
1.1 Fundamental quantities and units. In science there are five fundamental, or base, quantities – all other quantities are related to these. Mass (symbol m), length (l) and time (t) are three of these quantities. We will use two others later: electric current and temperature.
