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MEASUREMENTS - Coggle Diagram
MEASUREMENTS
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Forces in Equilibrium
When all forces on an object is balanced, it is said that the object is in equilibrium.
The two objects are balanced and in equilibrium because vectors of the opposing direction have the same magnitude value
- resultant force in any direction is equal is zero
- resultant moment about any point is equal to zero
Prefixes
- Prefix/Abbreviation/Power
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- To simplify huge or minuscule quantities, an alternative
Errors and Uncertainties
[Systematic Errors]
-errors of measurements which yield a consistent over-estimation or under-estimation of the true value
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Precision and Accuracy
Precision
- Precision refers to the extent or limit of sensitivity of a given measuring instrument
Example, a mm screw gauge is said to be more precise than a metre rule
- Precision also refers to the degree of scattering of data
This refers to large differences between measured values
Accuracy
- Accuracy refers to the percentage uncertainty of a measured quantity.
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- Accuracy is how close the data obtained is to the actual value
For a true value of 10.5 cm, if data measured is 10.3cm and 10.0 cm. The 10.3 cm is said to be more accurate