Physics › Section B · Kinematics in one and two dimensions › Topic B.2
Time, velocity, and speed
Knowing where something ends up is only half the story; you also want to know how quickly it got there. This topic defines elapsed time, velocity and speed, both averaged over a trip and at a single instant, and shows why speed and velocity are not the same thing.
In this topic
- How quickly does position change?
- Time and elapsed time
- Average velocity
- Average speed
- Worked example: a delivery robot
- Instantaneous velocity
- Worked example: closing in on an instant
- Constant velocity
- Worked example: an out-and-back drive
- Units and a feel for speeds
- Common mistakes to avoid
- Key takeaways
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