Units & Dimensions!
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Transcript of Units & Dimensions!
Units & Dimensions!
What we measure with!• Unit -
What we measure!
• Dimension -
• Fundamental dimensions - Basic, measurable characteristics which are not comprised of simpler or different dimensions.
• For our purposes, there are four fundamental dimensions:
Length MassTime Electric Charge
Units & Dimensions!
• Derived dimensions - More complex measurable characteristics which are comprised of combinations of simpler or different dimensions.
• Examples: Units Dimensions
Velocity – Miles length Hour time
Density – Mass mass Volume length x length x
length
Units & Dimensions!
• Unit Manipulation - This refers to the rules that govern how we use and combine units in calculations.
1. Like Units may be added and subtracted.
5 grams + 4 grams = 9 grams
2. Units of different dimensions cannot be added
or subtracted (this makes no sense).
5 grams + 4 seconds = ?????