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1. 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.
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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
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range of length in physics: from the shortest side, "Planck length" approximately 10 35 m to the longest, the size of universe about 1027 m. The size of the largest virus is about 10 6 m, the size of atom is about 10 10 m, and the radius of Earth is about 6 106 m. You may think the numbers are outrageously small or large. But physicists have a ...
- Introduction:
- | |{z} |{z} |{z} |{z}
- Fundamental and derived units
- Example
- System of units:
- SI base units
- Derived quantity
- Relationships of the SI derived units with special names and symbols and the SI base units
- SI prefixes
- Final recommendations regarding Units and Dimensions
We express physical quantities in terms of numbers. These numbers are obtained from measurements. It is clear right from the start that we need precise definitions for these terms: A quantity in the general sense is a property ascribed to phenomena, bodies, or substances that can be quantified for, or assigned to, a particular phenomenon, body, or ...
value of the physical quantity numerical value unit numerical value unit
We said we need units to measure physical quantities. This process usually goes as follows: Single out (Identify) the class of phenomena of interest (mechanics, electromagnetics, etc) List physical quantities involved. Adopt standard reference values for fundamental quantities. Realize that mathe-matical expressions relate these quantities, therefo...
Phenomenon: Geometry of objects Physical quantities: Length Fundamental units: meter (symbol m). Derived units: Area: meter squared (symbol m2) Volume: meter cubed (symbol m3) Here are some other examples to think about: Example Phenomenon: kinematics of bodies Physical quantities: Distance, Time, Velocity, Acceleration Fundamental units: Distance:...
A set of fundamental units that is sufficient for measuring the properties of the class of phenomena under consideration is called a system of units.
The SI is founded on seven SI base units for seven base quantities assumed to be mutually independent: SI base units Unit of length Unit of mass Unit of time Unit of electric current
plane angle solid angle frequency force pressure, stress energy, work, quantity heat power, radiant flux of electric charge, quantity of
The diagram above shows graphically how the 22 SI derived units with special names and symbols are related to the seven SI base units. In the first column the symbols of the SI base units are shown in rectangles, with the name of the unit shown toward the upper left of the rectangle and the name of the associated base quantity shown in italic type ...
The 20 SI prefixes used to form decimal multiples and submultiples of SI units are All other quantities are derived quantities, which may be written in terms of the base quan-tities by the equations of physics. The dimensions of the derived quantities are written as products of powers of the dimensions of the base quantities using the equations tha...
Be VERY careful to give units with any numerical quantity. Be VERY careful not to mix units — “do not compare apples & oranges” Use dimensions as a check on equation correctness. MIT OpenCourseWare https://ocw.mit.edu/
Jun 1, 2006 · Geodetic Survey 1986), height is defined as, “The. distance, measured along a perpendicular, between. a point and a reference surface, e.g., the height of. an airplane above the ground ...
Measuring Height. Title: PowerPoint Presentation Author: Eleanor R Hodby Created Date: 10/17/2020 8:46:53 PM ...
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Chapter 1 Units, Physical Quantitie. , and Vectors1 The Nature of PhysicsPhysics is an. experimental science.Physicists make observations of physical phenomena.Ph. sicists try to nd patterns and principles th. t relate to these phenomena.These patterns are called physical theories. And, over time, if. hey become well established, they are ...
