## Wednesday, September 25, 2013

### What is Mass?

Today we explored matter and mass. We used the book What is Mass? to generate a discussion about what mass means. We learned that the mass means how heavy something is. We also learned that anything you can see, feel, touch, and smell is matter. Objects that contain more matter have more mass.

I brought out a large beach ball and a small apple. I asked my students which object they thought had more mass. Of course they ALL said the beach ball and when I asked them why they thought the beach ball had more mass they said because it was bigger than the apple. Obviously, this is a common misconception for little ones. By the end of the lesson most of my students had a clear understanding that  the size of an object did not necessarily relate to its mass.
We passed the beach ball and the apple around the circle so that we could compare which one felt heavier in our hands. After each child had the opportunity to hold both objects I asked them if they still thought the beach ball had more mass. A lot of them changed their mind at this point and decided the apple had more mass. Throughout the entire lesson I asked the same questions about more mass/less mass and more matter/less matter over and over. Understanding matter and mass can be difficult for some little ones, especially when mass does not necessarily relate to size.
We did this simple mass comparison activity as a whole group for more practice on more mass and more matter. I placed two pictures of objects on the chart and then I called students up to tell me which one had more mass and why. Then they circled the object with more mass.

I am so tired of black and white! It is not nearly as much fun as color. My district took all of the colors printers out of the schools- even the one in the office. I have sent off a handful of jobs to the district print shop since the first week of school and I have yet to receive anything back :(
Today we worked together to learn how to use the primary balance. I showed students a can of play doh and a cup of sticks. I asked them which one they thought had more mass and why. Then we used bear counters to compare the mass of the two objects.

I modeled how to use the primary balance because tomorrow we will spend some time exploring balance and mass in small groups.