Speed: the distance travelled by an object per unit time

• Average Speed = Distance/ Time

  metre per second (m s⁻¹)

  kilometre per hour (km h⁻¹)

Distance time graph

• Motion
  • moves at a steady speed
  • at rest
  • is in non-uniform motion (increasing/ decreasing speed)

Example: Distance-time graph of the bus

| 0-30 s | slopes up ◦ moves at a steady speed | | --- | --- | | 30-40 s | flat/ horizontal ◦ at rest |