2. Yoheved ’ s conflict: Assumptions: the baby cannot swim. the baby cannot float on the water. Throw the baby to the Nile Hide the baby at home Protect the baby Protect the rest of the family Protect the whole family
3. The Injection: Put the baby in a box that can float on the water How to build the box? What materials can float on water? We ask:
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6. Step 2: explain the phenomenon The concept: Density The ratio between weight and volume The density of water is 1 g/ml Why? The object’s density is less then 1 The object is full with air The object is floating on the water
7. Step 3: changing a parameter How can we make a sinking object float? How can we make a floating object sink?
8. The object’s density is more then 1 Step 3: changing a parameter How can we make a floating object sink? We add weight to the Styrofoam ball The ball will sink
9. The object’s density is less then 1 Step 3: changing a parameter How can we make a sinking object float? We block the pipe with plasticine The pipe will float
10. The object’s density is less then 1 The oil is getting to the small holes instead of the air and prevent absorption of water Step 3: changing a parameter How can we make a sinking object float? We put oil on the paper The paper will float
11. Back to the Injection: The object’s density is less then 1 The tar prevents absorption of water Take the baby and put it in a box made of papyrus The baby will float on the water Coat the box with tar The baby will safely float for long time
12. Thank You! Dr. Rami Kallir +972-46380422 +972-52-2786758 [email_address]
![Using a Story Sink or Float: Moses in the Nile ,[object Object],[object Object],[object Object],[object Object],[object Object]](https://image.slidesharecdn.com/mosesonthenile-110713011414-phpapp01/85/moses-on-the-nile-1-320.jpg)
