# Sink or Float HELP CHILDREN TALK ABOUT SINKING AND FLOATING:

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3 Boats that Sink and Float Have each child draw one boat design that sinks, and one that floats. Check to see that children correctly position their boats on top or below the surface of the water in their drawings. Sink Float SESAMESTREET.ORG/STEM /TM 2013 Sesame Workshop. All Rights Reserved. Page 3

4 What Sinks? What Floats? GOAL Observe that some objects sink and some float. QUESTION What do you notice about objects that sink and objects that float? TIME minutes MATERIALS For each small group of children:» 1 water table or clear basin or bucket of water.» 1 bag of 6 to 12 different small objects that can get wet (suggested items that sink: rock, metal spoon, clay ball, rubber band, blocks, baseball; suggested items that float: pencil, leaf, popsicle stick, aluminum foil, plastic math counters, paper index card, plastic bottle)» 2 large containers, one labeled SINK and one labeled FLOAT» Activity Chart (one per child)» crayons In this activity, children will explore what sinks and what floats by testing different objects. STEPS 1. Ask children, Which items do you think will sink? Which do you think will float? 2. Have children test the objects by putting them in the water one at a time. 3. After an item is tested, have a child put the object into the SINK container or FLOAT container. 4. After all the materials are tested, count how many objects sink and how many float. Then, have children record the information with pictures onto the chart. 5. Ask, What did the sinking objects have in common? What did the floating objects have in common? Guide the children to discuss the shape and material of each object. 6. If there is time, help children find other objects to test. Before they put an object in the water, have them make a hypothesis about whether they think it will sink or float based on what they just observed. TUBE EXPLORATION Test a paper towel tube. Will it sink or float? Now wrap another paper towel tube carefully in aluminum foil so that it is watertight. Will it float? What happens if children open the foil-covered tube and place weights inside and rewrap it? Will it still float? SESAMESTREET.ORG/STEM /TM 2013 Sesame Workshop. All Rights Reserved. Page 4

5 What Sinks? What Floats? Have children draw the objects that sink or float. Sink Float SESAMESTREET.ORG/STEM /TM 2013 Sesame Workshop. All Rights Reserved. Page 5

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