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===Representing Vectors===
: [[Vector]]s are written with either an underline (<math>\underline{F}</math>,<math>\underline{s}</math>,<math>\underline{v}</math>,<math>\underline{a}</math>) or an arrow above (<math>\overrightarrow{F}</math>,<math>\overrightarrow{s}</math>,<math>\overrightarrow{v}</math>,<math>\overrightarrow{a}</math>).
: [[Vector]]s are often drawn on [[diagram]]s. They are drawn as an arrow because an arrow can show the [[magnitude]] (the length of the arrow) and the direction (which way the arrow is pointing).
{| class="wikitable"|-|[[File:Vectora.png|center|200px]]|[[File:Vectorb.png|center|200px]]|-| style="height:20px; width:200px; text-align:center;" |The [[vector]] <math>\underline{a}</math> is shown by this arrow. The length of the arrow represents the [[magnitude]] of the [[vector]] and the direction of the arrow shows the direction of the [[vector]].| style="height:20px; width:200px; text-align:center;" |The [[vector]] <math>\underline{b}</math> is shown by this arrow. The length of the arrow represents the [[magnitude]] of the [[vector]] and the direction of the arrow shows the direction of the [[vector]].|-|colspan = '2'|The arrow <math>\underline{b}</math> is shorter than the arrow <math>\underline{a}</math> so the [[vector]] <math>\underline{b}</math> has a smaller [[magnitude]] than <math>\underline{a}</math>. It can also be seen that [[vector]] <math>\underline{b}</math> has a different direction to [[vector]] <math>\underline{a}</math>.|}
: Using a [[diagram]] two [[vector]] quantities can be added together by drawing the arrows end to end.