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→Key Stage 4
: There are two types of [[orbit]] you should know:
:*Circular [[orbit]] - An [[orbit]] where the distance between the two [[object]]s (the [[radius]]) remains constant. In this [[orbit]] the [[speed]] of the [[orbit]]ting [[object]] is constant. However, the [[velocity]] of the [[orbit]]ting [[object]] is constantly changing due to the changing direction.
{| class="wikitable"
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|[[File:CircularMotion.gif|center|]]
|-
| style="height:20px; width:200px; text-align:center;" |This animation shows [[acceleration]] due to the changing direction of a circular [[orbit]] of the blue [[object]] around the red [[object]]. A circular [[orbit]] is one of constant [[radius]].
|}
:*Elliptical [[orbit]]