Protista - Measuring Motion

Velocity is a measure of the amount of distance traveled in a time. To find a relatively accurate velocity for the Protista, we will be using several samples.

Step 1. From an amalgamation image, calculate the total distance traveled by adding up the distances for each segment. Show your work for YOUR group's amalgamation:

Total distance = d1 + d2 + d3 + d4 (use all your distances, this is just an example)

Step 2. Calculate velocity. Show your work:

average velocity = total distance / time

Step 3. Record the velocity for each amalgamation. Determine the average velocity for each protist by repeating Step 1 and 2 for the best 8 amalgamations from among all the classes.

Volvox velocity (μm/s)
Paramecium velocity (μm/s)
Trial 1

Trial 2

Trial 3

Trial 4

Trial 5

Trial 6

Trial 7

Trial 8


Step 4: View samples of all 4 organism videos.
Using the above data and your observations, rank order the
Protists from fastest to slowest by name.

  1. Fastest
  2. Second fastest
  3. Slower
  4. Slowest

List at least 2 sources of error which might occur in using this method of determining rate and
how the procedure(s) could be made more accurate if you were to repeat it.