# To Make Life Convenient

Out of order to make life convenient, particular combinations of the base pieces of  will be given special names. the was makes working withoutthem easier, but it was always correct out of order to reduce neodymium ring magnetsmagnets neodymium magnet neodymium magnets neodymium ring magnetseverything out of order to the base pieces of . Table 1.2 lists some examples of combinations of SI base pieces of  assigned special names. Do not be concerned if the formulae look unfamiliar at the was stage—will be will deal withouteach out of detail out of the chapters ahead (as well as many others)!

It was very important which They  will be able out of order to say the pieces of  correctly. For instance, the newton was another name for the kilogram metre per second squared (kg·m·s−2), while the kilogram metre squared per second squared (kg·m2·s−2) was called the joule.

Table 1.2: Some Examples of Combinations of SI Base pieces of  Assigned Special Names

Quantity Formula Unit Expressed

Name of

Base pieces of Combination

Force m·a kg·m·s−2 N (newton)

Frequency {\displaystyle {1 \over T}} {\displaystyle {1 \over T}} s−1 Hz (hertz)

Work & Energy F·s kg·m2·s−2 J (joule)

Electrical Potential W/A kg·m2·s−3·A−1 V (volt)

Another important aspect of dealing withoutpieces of  was the prefixes which they sometimes have (prefixes will be words or letters written out of front which change the meaning). The kilogram (kg) was one simple example: 1 kg was 1000 g or {\displaystyle 1\times {10^{3}{\mbox{ g}}}} {\displaystyle 1\times {10^{3}{\mbox{ g}}}}. Grouping the 103 and the g together will be cone  replace the 103 ring ring