Lesson Plan:

Matter: Sink or Float

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August 20, 2015
by Nichelle Neal
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August 20, 2015
by Nichelle Neal

Learning Objectives

Students will learn the relative densities of different objects.


Introduction (10 minutes)

  • Ask the students what items they think will sink or float.
  • Don't make it specific to the items that you are going to use. Let the students give you a list of random items they think will sink or float.

Explicit Instruction/Teacher Modeling (15 minutes)

  • Take out the chart with each object listed.
  • Have the students reflect on whether they think each object with sink or float.
  • Take votes to see who thinks the item will sink and who thinks the item will float.
  • Post the chart to use later for closing the lesson.

Guided Practice/Interactive Modeling (10 minutes)

  • Pick two of the objects on the Sink or Float worksheet and test out the predictions with the students.
  • Organize students into small teams.

Independent Working Time (10 minutes)

  • Have students work with their team to finish the rest of the sink or float activity and determine whether their predictions were correct.



  • Enrichment: Have advanced students journal about other objects that might be on the border for the sink or float discussion.
  • Support: Give struggling students one-on-one assistance over the course of the lesson.


Assessment (15 minutes)

  • Have you students write down about what they predicted and what the outcome was.

Review and Closing (5 minutes)

  • Review the predictions. Make changes to the chart if needed.

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