Enrichment Lesson 4: Preparation Instruction

Teacher Preparation: There are three components to prepare:

 Preparing the Substrate Materials 1. Select a substrate for the entire class to use. 2. Measure and mark the depth of substrate (6cm) on the inside perimeter of each loaf pan before filling. 3. Fill pan with the substrate you are using to 6 cm depth. 4. Identify and mark the center of the long side of the loaf pan at a height of 3cm from the bottom. This is where the mass will make contact. Preparing the Pendulum and Ring Stand 1. Measure and cut string approximately 50cm in length. 2. Set the ring so that the bottom of the ring is 45-50cm from the table surface. 3. Attach one end of the string to bottom of ring and tape it in place. 4. Attach the 50g mass to the other end of the string at approximately 47cm. The mass, at rest should be at the mid-mark of the loaf pan. 5. Attach (with masking tape) and adjust the protractor so that the string, at rest, aligns with the 0 mark. Note:  Once the apparatus is in place, it is important that the teacher check both the lengths of string and the placement of the loaf pans.  All strings should be equal in length (47cm) and the placement of the pans should be identical with regard to the pendulum.  Check the placement of the pans by lining up the mass at rest with the contact point on the pan. Please remember that any variation in the set up of equipment or experiment might lead to corresponding variations in data. Preparing the Mock Houses Finally you need to create some mock houses for the students to test. Ideally they fit in the loaf pans easily and are fairly heavy (top heavy if possible); perhaps 100g or so in weight. Here are some steps you can follow to make some mockhouses out of small milk cartons (presumably from the school cafeteria) and cement. Other ideas that operate along the same lines will work similarly. 1. Collect, clean and dry 6-7 mik cartons. 2. Mix up enough cement mix and water so that you can fill each carton just under half way. 3. Fill each carton about 1/4 to 1/3 of the way with the cement mix. Do your best to fill them equally. 4. Allow cartons at least 24 hours to dry.

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