** Next:** Velocity
**Up:** Motion
** Previous:** Motion

#

Position

The first idea needed in describing the motion of an object is its
**position** relative to some fixed reference point. This entails two ideas: the distance the object is
away from the reference point, and also the direction relative to
that reference point. For example, one could say that Toronto is
about 3000 km east of Vancouver. Position, as defined above, is said
to be a vector quantity, because it has both a magnitude, or size, (the
distance) and a direction. Sometimes we wish to talk about the
position of an object relative to its starting point at some initial
time. This is called the **displacement** of the object.

*modtech@theory.uwinnipeg.ca *

1999-09-29