a) quantities

• state the nature of speed and distance and define distance

• state the formula for average speed

• explain how to calculate instantaneous speed

• speed and distance are scalar quantities

  • distance = the length between two points

• v = ∆x/∆t

  • average speed (ms^-1) = change in distance (m) / change in time (s)

• to calculate instantaneous speed (ms^-1)

  • draw a tangent to the distance-time graph at the given time

  • calculate the gradient of the tangent using rise/run

• state the nature of velocity and displacement and define displacement

• state the formula for average velocity

• velocity and displacement are vector quantities

  • displacement = the shortest distance between two points

• v = ∆s/∆t

  • average velocity (ms^-1) = change in displacement (m) / change in time (s)

• state the nature of acceleration and define acceleration

• state the formula for acceleration

• acceleration is a vector quantity

  • acceleration = the rate of change of velocity

• a = ∆v/∆t

  • acceleration (ms^-2) = change in velocity (ms^-1) / change in time (s)

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