Measurement Lab

Thanks for a good class today; I appreciated how well you stuck to the task.  It was all a big hurry, so now is the time to gather your thoughts and pull out the "moral of the story" which is, how do we take accurate measures?  

You must have accurate and honest weights and measures, so that you may live long in the land the LORD your God is giving you.   Deuteronomy 25.15

Your scales and weights must be accurate. Your containers for measuring dry materials or liquids must be accurate. I am the LORD your God who brought you out of the land of Egypt. Leviticus 19:36 

 

First, we wrote in our lab books our personal definitions of mass, volume and density.
Then we proceeded to measure.

1. No Need to Count Your Pennies - You should have a full-page copy of this lab activity sheet; Table 1 should have been filled out in class -- number of coins, mass in grams, and thickness in millimeters. Homework is to complete the worksheet: Graphs 1 & 2 and the questions on the back.

2. Length, Width & Height - This half-page should be glued or taped in your lab books, and you should have measured in centimeters, but to the nearest millimeter, so your numbers should have one decimal place, like this -->  3.1 cm, 8.6 cm and so on.  The volume is figured by multiplying each dimension (length x width x height) and the units for that is cm^{3,   (called cubic centimeters).}

3. The Water Displacement Lab - Finding the volume of irregularly shaped objects, like rocks or my  little yellow friend, Density Dan. Your pre-lab paper, which was how to find the water level on graduated cylinders, should have these answers:

1.  6 mL  2. 12 mL3. 1.6 mL4. 3.4 mL

and also taped or glued into your lab books was the half-sheet "Water Displacement".  To find the volume you had to find the difference (subtraction!) between starting and ending mL.   Do you understand this?

Now, write in your lab books your revised definitions of mass and volume.

Take this further:  Using only things you find in your kitchen, find the volume of your hand. (This is an exercise in problem solving -- don't ask your mom how to do it.)  In your lab book, describe step-by-step how you did this.

So, how many of you still have all your papers from class and they are neatly glued in your lab books?  Congratulations! Hopefully you can all read your own writing; some of you may consider putting a bit more effort into legible handwriting.  Also, if you are rusty or unfamiliar with decimals, ask your mom to have you work on that in math. For now you should be able to add, subtract and multiply using decimals to the tenth's place.   For math tutorials, try Khan Academy: https://www.khanacademy.org/math/arithmetic/decimals

Once again, practice vocabulary using Quizlet: http://quizlet.com/18339712/glencoe-physical-science-chapter-1-flash-cards/
Review the main ideas of this chapter with the Chapter Study Guide on Pages 32-35. Answer questions 1-10, 16, 18, 19