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Physics I (Mechanics): Kinematics in one and two dimensions · Displacement, Velocity and Acceleration

How displacement, velocity and acceleration differ, how to read them from motion graphs, and why average speed and average velocity often disagree.

Physics I (Mechanics) · 25 questions

Try 3 questions

1. You walk 3 km east, then 3 km back west to where you started, all in one hour. What is your average velocity?

  1. Zero
  2. 3 km/h
  3. 6 km/h
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Answer: Zero

Average velocity is displacement divided by time, and returning to the start makes the displacement zero.

2. For that same 3 km out-and-back walk in one hour, what is your average speed?

  1. 3 km/h
  2. 0 km/h
  3. 6 km/h
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Answer: 6 km/h

Average speed uses total distance traveled, 6 km, divided by the 1 hour elapsed, regardless of direction.

3. Can an object have zero velocity and nonzero acceleration at the same instant?

  1. No, zero velocity means zero acceleration
  2. Only if it is moving in a circle
  3. Yes, for example at a turning point
Show the answer

Answer: Yes, for example at a turning point

Acceleration is the rate of change of velocity; at a turning point velocity passes through zero while still changing.

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