Free Kindergarten Sink Or Float Lesson Plan

Topic: Sink or Float

Objectives & Outcomes

  • Students will be able to identify whether objects sink or float in water and express their findings orally.


  • Various objects such as coins, paper clips, pencils, popsicle sticks, etc.
  • Water basin or container
  • Scales (optional)


  • Show the students the various objects and ask them if they think the objects will sink or float in water. Allow them to give their reasons for their answers.
  • Have the students predictions put to the test by placing the objects in the water basin or container and observing the results.

Direct Instruction

  • Explain to the students that the ability of an object to sink or float in water depends on its weight relative to the amount of water it displaces.
  • Tell the students that if an object is heavier than water, it will sink. If it is lighter than water, it will float.
  • Have the students repeat the rules for sinking and floating out loud with you.

Guided Practice

  • Divide the students into pairs and give each pair one or more objects to test for sinking or floating in water.
  • Have the students place the object(s) in the water and observe how they behave. -Encourage the students to describe what they see and make any predictions about the object(s) behavior.
  • If necessary, have the students test another object and repeat the process.

Independent Practice

  • Have the students work in small groups to test several objects and record their observations and predictions.
  • Encourage the students to communicate effectively and reach a consensus about the behavior of each object.
  • Have the students present their findings to the class, orally or through drawings or writing.


  • Review the steps for testing objects for floatability and the meaning of sink and float.
  • Ask the students to share their observations and discuss any surprising or unexpected results.
  • Remind the students that not all objects sink or float and that different objects may behave differently in water.


  • Observe the students during the independent practice and listen to their oral presentations to assess their understanding of the concept of sink and float and their ability to test objects and describe their findings. -Evaluation
  • Collect the students' written observations and their taped oral presentations and use them to assess their understanding of the concept of sink and float.

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