# Sink or Float Lesson Plan

Instructor: Sharon Linde
Use this Study.com lesson to teach your students about buoyancy, gravity, and density. Have students make calculations to predict buoyancy, then experiment with water.

## Learning Objectives

After this lesson, students will be able to:

• determine the density of an object
• define buoyancy, gravity, and density
• calculate an object's density
• predict whether an object will float or sink

• 1 ½ hours

## Curriculum Standards

• CCSS.ELA-Literacy.RST.6-8.3

Follow precisely a multistep procedure when carrying out experiments, taking measurements, or performing technical tasks.

• CCSS.ELA-Literacy.RST.6-8.7

Integrate quantitative or technical information expressed in words in a text with a version of that information expressed visually (e.g., in a flowchart, diagram, model, graph, or table).

• CCSS.ELA-Literacy.RST.6-8.8

Distinguish among facts, reasoned judgment based on research findings, and speculation in a text.

## Materials

• Several types of objects that can be weighed, measured, and put in water
• Scales, rulers, calculators, and other tools for measuring
• Container that holds water and is large enough for objects
• Lab sheet with columns for 'Object,' 'Volume,' 'Mass,' 'Density,' 'Prediction,' and 'Result'

## Instructions

• Watch our Study.com video lesson Predict Whether an Object Will Sink of Float: Understanding Density.
• Pause at 3:30 for clarification. Ask:
• What two forces impact whether or not an object floats?
• What do we know about gravity?
• Which is more important when determining buoyancy, gravity or buoyancy force? Why?
• How does an object's density impact its buoyancy?
• Play the remainder of the video.

### Activity

• Tell students they will be predicting whether or not objects will sink or float by calculating density as seen in the video.
• Demonstrate with one object, calculating density and comparing it to the density of water. Fill out a sample lab sheet to clarify for understanding.
• Allow students to calculate density of objects, then make predictions.
• Circulate the room to check for understanding.
• After all students have made calculations and predictions, share data and discuss findings.
• Allow students to test their findings by dropping objects into water and noting the results.
• Have students write a rule about their findings to turn in as an exit slip.

## Extensions

• Have students experiment with density by increasing the mass and volume of objects, then calculating density. What happens?
• Have students bring in items from home and repeat the experiment.

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