Explore Float and Sink

Overview

This lesson is designed for preschool students to explore the concept of density through a simple sink or float activity. The lesson aligns with the Kansas Early Learning Standards (KELS), focusing on the child's ability to stay focused on a task for at least five minutes (ATL.p4.3). This activity aims to spark curiosity, encourage predictions, and introduce basic scientific reasoning.

Duration

Total Time: 15 minutes
Class Size: 18 students

Learning Objectives

• Understand the basic concept of density related to floating and sinking.
• Develop skills in making and testing predictions.
• Enhance focus and concentration on a task for at least five minutes.

Materials

• A clear plastic tub or bin filled with water
• A variety of small objects (e.g., rubber duck, plastic spoon, small rock, cork, sponge, metal key, ping pong ball)
• Towel or mat to catch spills
• Chart paper and markers for recording predictions and observations

Standards

Kansas Early Learning Standards (KELS):

• ATL.p4.3: Child focuses on a task of interest for at least 5 minutes.

Lesson Structure

Introduction (3 minutes)

1. Gather the students around the water bin area and have them sit in a semicircle.
2. Explain the activity: Tell the students they will be scientists today, observing which objects sink and which float.
3. Introduce the concept of density: Give a brief and simple explanation, "Density is about how tightly packed together the tiny pieces inside an object are. If an object is heavy for its size, it might sink. If it feels light for its size, it might float."

Activity - Sink or Float Exploration (8 minutes)

1. Predict and test:

   • Show each object to the students, one at a time, and ask them to predict whether it will sink or float.
   • Record their predictions on the chart paper.
   • Allow each child to take turns placing an item in the water and observe the results.

2. Discuss observations:

   • Ask questions like, "What happened with the rubber duck?" and "Why do you think the rock sank?"
   • Highlight the concept of density, reinforcing which materials are denser than water and therefore sink, and which are less dense and float.

Closing (4 minutes)

1. Review the activity: Summarize what was observed and learned about floating and sinking.
2. Reflect on focus time: Acknowledge the students for staying focused, "You all did a wonderful job being scientists and staying focused on our sink or float experiment!"
3. Conclude with a question: Encourage them to think beyond what they observed - "What objects at home can you test to see if they sink or float?"

Assessment

• Observation: Monitor children's engagement and their ability to stay focused on the activity for at least five minutes.
• Participation: Check for active involvement in predicting and discussing the sink or float results.

Extensions

• Home Activity: Suggest parents engage their child in a similar sink or float experiment using household items.
• Art Integration: Have students draw pictures of objects that float and sink.

By making this session hands-on and interactive, preschool students will stay engaged and fascinated, nurturing their natural curiosity and foundational understanding of how the world works.