__Definitions:__

__Displacement:__a vector quantity that refers to how far an object is from its original position.__Instantaneous speed:__the speed of a car over a very short period of time, found by drawing the tangent to the distancetime graph and determining its gradient.__Average speed:__distance travelled divided by time taken.__Velocity:__change in displacement divided by time taken.__Acceleration:__the rate of change of velocity.

__Graphical representations of these quantities:__

All these quantities can be represented on graphs (quantity against time).

__Displacement-time graphs:__velocity is gradient.__Velocity-time graphs:__acceleration is gradient; displacement is area under graph.