Materials:

• A plastic spoon and a steel spoon
• Modelling clay
• A bowl
• Water

  Objective:

  Grow on the concept of floating and sinking to the child.

  To become familiar with objects which float and sink.

  To relate the characteristic of floating and sinking

  to weight, shape and density.

  To increase the child??s power of observation.

  To encourage the questioning of observation.

  Control of error: no

  Age: 3 years onwards.

  Adult/ child ration: 1 to 1

  Anticipated duration : 3 minutes

  Date of lesson: 10 April 2004

  Prerequisites:

  Students should know the concept of floating and sinking.

  Advance preparation for the lesson:

  To ensure all the materials are correct and prepare some water for the experiment.

  Step by step guidelines

  Introduction and background for teachers:

  Tell the child today we are going to play a game about to float or not to float. Before the experiment, teacher should describe and to encourage the child to recollect the concept of float and sink.

  When objects sink or float, they push water away. When water is pushed aside we call it displacement. If the amount of water pushed aside by an object weighs more than the object, the water can hold it up and it floats.

  If an object placed in the water pushes away an amount of water that weighs less than the object, the water can??t hold it up and it sinks.

  As swimmers know the feeling of weightlessness when they move or floating the water that water supports solid, canceling out some of theirs weight.

  The following experiment shows what is needed for an object to float, and how it is that some very heavy objects such as oceangoing ships keep afloat.

  Lesson plan

  This is an individual exercise carried out at a table.

  Ask student to describe going swimming. How does the water feel? How do you feel in the water? Have you ever been able to float or sink in the water? What helps you to float on the water? What things have you seen floating on water?

  1. Show items on table and encourage the child to predict which will sink or float.

  2. Fill the bowl with water.

  3. Encourage the child to feel the two different heavy of two spoons.

  4.Drop them one at a time in water. Observe what happens.

  5. Encourage the child to roll the clay into a ball and a ship. Place them on the water, and then see want happen.

  6. Compare predic
  ted results with what actually happened. Discuss why certain items floated and others sank.
  
  
  本文來自：逍遙右腦記憶 http://yy-art.cn/youer/467738.html
  
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