Systems of Measurement Units Assignment This assignment is to get familiar or refresh your knowledge about systems of measurement units. Reading, watching the video then answering assignment questions.

Please post your answers in the posting field, not in comments! There is no need to upload or attach any files.

Total 3 pts.

Systems of Measurement Units Assignment Instructions

1 Reading the definitions of units at https://physics.nist.gov/cuu/Units/current.html can you guess which one is determined by a particular physical object? Explain reasoning for your guess.

(In case the nist.gov site is unavailable please use: https://www.mathsisfun.com/measure/index.html and read about metric and standard systems)

2 Then watch https://www.youtube.com/watch?v=ZMByI4s-D-Y find which unit out the seven base units is in fact determined by a single object in the universe? Did you make a good guess?

3 Discuss why in the video for the round object they picked a sphere and not some other shape, any practical reasons?

4 Watch https://www.youtube.com/watch?v=PXiyqWnixqo and then https://www.

youtube.com/watch?v=SsULOvIWSUo .Give examples from the videos for practical reasons to have an accurate measure of time over the centuries.