Speed is a scalar: just a number. Velocity is a vector: a number and a direction. A car going steadily round a roundabout keeps a constant speed, yet its velocity changes every instant because the direction keeps turning. The same split shows up in distance, the whole path travelled, versus displacement, the straight line from start to finish, which returns to zero after a full lap.
MissionWatch the orbit, then judge whether the velocity stays constant.Streak 0Best 0
At constant speed around the circle, the velocity is:
speed (scalar)6 m/s
velocity direction (vector)0°
distance travelled (scalar)0.0 m
displacement from start (vector)0.0 m
the speed never changes, but the velocity does, because its direction turns.