Vernier Software & Technology

# Buoyancy

## Introduction

When an object is immersed in water, it pushes water aside. The buoyant force of water on the object reduces the weight of the object. In this experiment, you will determine and compare the buoyant force on an object and the weight of the water pushed aside (displaced) by the object for three objects. The Greek mathematician Archimedes first studied this relationship during the third century B.C.

## Objectives

In this experiment, you will

• Use a Force Sensor to measure the weights of objects in and out of water.
• Determine the buoyant force of water on each object.
• Determine the weight of water displaced by each object.
• Compare buoyant force to weight of water displaced for each object.
• Use the results of the experiment to explain why objects sink or float.

## Sensors and Equipment

This experiment features the following Vernier sensors and equipment.

### Option 2

You may also need an interface and software for data collection. What do I need for data collection?

## Middle School Science with Vernier

See other experiments from the lab book.

 1 A Hot Hand 2 Heating of Land and Water 3 The Greenhouse Effect 4 Relative Humidity 5 Soil Study 6 Absorption of Radiant Energy 7 Reflectivity of Light 8 Schoolyard Study 9 A Good Sock 10 What Causes the Seasons? 11 Solar Homes 12 Ocean Floor Mapping 13 Boiling Temperature of Water 14 Freezing and Melting of Water 15 How Low Can You Go? 15B Ziplock Ice Cream 16 A Good Cold Pack 17 Lemon "Juice" 18 Get a Grip! 19 Fun with Pressure 20 Water Hardness Study 21 Diffusion: How Fast? 22 A Water Field Study 23 Cooling Rates: Shaq vs. Susie 24 Yeast Beasts in Action 25 Heart Rate and Body Position 26 Heart Rate and Exercise 27 Mapping a Magnetic Field 28 Electromagnets 29 Frictional Forces 30 First-Class Levers 31 Pulleys 32 Buoyancy 33 Graphing Your Motion 34 Speeding Up 35 The Indy 100 35B Pencil Car 36 Crash Dummies 37 Falling Objects 38 A Speedy Slide

### Experiment 32 from Middle School Science with Vernier Lab Book

#### Included in the Lab Book

Vernier lab books include word-processing files of the student instructions, essential teacher information, suggested answers, sample data and graphs, and more.

Dev Reference: VST0232