The PDF from the OSPI on the Science standards says that this unit will focus on:
In upper elementary school students measure the quantities of force, time, and distance, and compare the speed of two objects. (p. 107)
I will be planning a two or three week unit that gives general guidelines for investigating measurement. See also page 6 for how this section of physical science fits into the K-12 science spectrum.
The focus is supposed to be on the use of an inquiry-based model, so look for me to document my specific learning about the learning and teaching of this topic.