Ask the class for suggestions on how mass can be measured and compared. Encourage the students to think about what was used in the video to measure and compare the mass of the elephant (the balance scales).
Show the students a set of balance scales. Encourage the students to suggest how they work. Demonstrate their use by comparing the masses of various objects from around the classroom.
Introduce the task of making a set of balance scales. Show the students the materials to be used and demonstrate the process step-by-step. Alternatively, watch an instructional video online.
Provide the students with the necessary materials to construct their balance scales. Monitor and support the class during the construction process.
When completed, allow the students to use their balance scales to compare the masses of various objects around the classroom.
Gather together as a class. Invite the students to share some of their comparisons e.g. I compared a ball and some blocks. The blocks were heavier than the ball.
Complete a class PMI Chart (Plus, Minus, Interesting) for the construction of the balance scales.
Encourage more capable students to assist less confident peers when building the balance scales.
Allow less confident students to be assisted by more capable peers when building the balance scales.
Suggested Assessment Strategies
used strategic whole class or individual questioning
observed student participation during learning activities