Measuring the Density of Regular and Irregular Objects: Sweet Spot

It was on Wednesday 1^st April 2015, that I finally got to organize a group of only a sample of 7 students  to watch an off line  video (https://www.youtube.com/watch?v=2jB84Sq6Ygg) that I had saved in my hard drive to see the impact it would have created if the whole class was taken online to view. I gave the students the chance and went out for like 8 minutes on coming back I replayed the clip again. I asked them on anyone who would explain what they watched, here is the explanation:

1.    That the first thing the teacher got a coin and showed us how to determine the thickness of the coin using micrometer screw gauge

2.    Then he brought in another instrument which was used to measure the diameter of the coin.

3.    The mass of the coin was measured using a balance which gave the reading on the top.

4.    Then the volume of a stone was measured using a measuring cylinder

The major challenge cited was that some of the instruments though they had seen them previously but did not know how well they can be used for measurements. And that the teacher was very fast in his demonstration besides, the video had a background music which they thought also took partly their attention.

Some of the instruments that can possibly be used in this demo

Infact the major goal of this virtual class was to only realize if learners can discover things on their own without the help of a teacher when they are left alone and this goal was actually achieved because they would finally get to use the formula for finding density which was taught in class i.e

 

 Ciao!