Speed
Speed says how fast a thing covers ground. Average speed is the distance travelled divided by the time it took: a bus that goes 1,200 metres in 80 seconds has an average speed of 15 metres per second. Speed is measured in metres per second, or in kilometres per hour for cars, and to turn kilometres per hour into metres per second you divide by 3.6. The speed at one moment, the number a speedometer shows, is the instantaneous speed; when it never changes, the motion is uniform. Speed has no direction: that is what makes it different from velocity.
Depth 1 · Foundation
You can work out an average speed as the distance travelled divided by the time taken, in metres per second and kilometres per hour, and convert between the two.
Sign in to prove what you know with a short quiz, see how deep you've gone, and earn XP for it.
Sign in with GoogleDepths of understanding
- 1
Foundation
You can work out an average speed as the distance travelled divided by the time taken, in metres per second and kilometres per hour, and convert between the two.
- 2
Deeper
You know that the instantaneous speed is the speed at one moment, as a speedometer shows it, that it equals the average speed only when the speed never changes, and what uniform motion in a straight line and in a circle is.
Master depth 1 first
Your path here
What's still between you and Speed, depth 1, in the order you can learn it.