The motion of objects can be analysed using equations and graphs. These tools allow other aspects of motion such as acceleration and displacement to be determined or modelled.

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Physics can be described as modelling the natural world using mathematics.

In the case of moving objects, physics can accurately record and even predict the movement of objects using a set of physical laws and equations.

These equations have helped launch space vehicles and are responsible for the realism of many computer games.

The equations of motion relate to the following five quantities:

**u**- initial velocity**v**- final velocity**a**- acceleration**t**- time**s**- displacement

Of the above u, v, a, and s are vector quantities. Time (t) is a scalar quantity.

If any three of the five quantities are known then the other two may be calculated using the following four equations:

The equations of motion can only be used for an object travelling in a straight line with a constant acceleration.

Remember to make vectors going in one direction positive and vectors in the opposite direction negative.