Science · Grade 2 · Air and Water in the Environment · Term 3

Understanding Wind

Students will investigate what causes wind and how its speed and direction can be measured.

• Ontario Curriculum Expectations
• 2-ESS2-1

About This Topic

Wind forms when the sun heats Earth's surface unevenly. Warm air rises, creating areas of low pressure, while cooler air from high-pressure zones flows in to replace it. Grade 2 students investigate this process by observing daily weather changes and using simple tools. They design wind vanes with straws, paper arrows, and pencils to track direction. For speed, they test pinwheels, streamers, or cup anemometers made from plastic cups and dowels.

This topic supports the Air and Water in the Environment unit in Ontario's Grade 2 curriculum. Students predict strong wind effects on trees, buildings, flags, and playground equipment, recording data to spot patterns. These activities build skills in questioning, designing, and communicating findings.

Active learning works well for wind because forces are invisible yet observable through student-made tools. Building, testing outdoors, and comparing group results make concepts concrete. Discussions after trials help students refine predictions and connect observations to explanations.

Key Questions

1. Explain what makes the wind blow.
2. Design a simple wind vane to show wind direction.
3. Predict how strong winds might affect trees and buildings.

Learning Objectives

• Explain the cause of wind using the concept of uneven heating of Earth's surface.
• Design and construct a simple wind vane to accurately indicate wind direction.
• Measure wind speed using a student-made pinwheel or streamer.
• Predict the potential effects of various wind strengths on common objects like trees and buildings.
• Compare and contrast the results of wind speed measurements taken at different times or locations.

Before You Start

Observing Weather

Why: Students need to be able to observe and describe daily weather conditions before investigating the causes of wind.

Materials for Building

Why: Students should have experience using simple materials like paper, straws, and tape to construct objects.

Key Vocabulary

Wind	The movement of air from one place to another, caused by differences in air pressure.
Air Pressure	The weight of the air pressing down on Earth's surface. Differences in air pressure cause air to move.
Wind Vane	A tool used to show the direction from which the wind is blowing.
Anemometer	A tool used to measure wind speed, often with spinning cups or a pinwheel.
Uneven Heating	When different parts of Earth's surface are heated by the sun at different rates, leading to temperature and pressure differences in the air.

Watch Out for These Misconceptions

Common Misconception

Wind comes only from trees waving their branches.

What to Teach Instead

Wind causes trees to move, not the reverse. Hands-on tests with fans on still objects show air pushes items, helping students reverse their thinking. Group demos with leaves clarify direction of force.

Common Misconception

All wind blows in the same direction every day.

What to Teach Instead

Wind direction changes with pressure differences. Outdoor vane rotations tracked over days reveal shifts, and class data sharing corrects fixed ideas. Peer comparisons build evidence-based understanding.

Common Misconception

Wind speed is measured by how loud it sounds.

What to Teach Instead

Sound relates but visual tools like spinning cups give accurate gauges. Station activities let students compare senses to tools, refining judgments through repeated trials and discussions.

Active Learning Ideas

Design Challenge: Simple Wind Vane

Provide straws, cardstock arrows, pins, and pencils. Students assemble a wind vane, mount it outdoors, and mark directions on a base plate. Over two days, they record wind direction hourly and discuss patterns. End with sharing sketches in a class chart.

45 min·Small Groups

Stations Rotation: Wind Speed Tools

Set up stations with pinwheels, ribbon streamers, and cup anemometers. Groups test each tool using a fan at low, medium, and high speeds, timing rotations or drops. Record qualitative levels like gentle or strong. Rotate every 10 minutes.

40 min·Small Groups

Prediction Walk: Wind Effects

Take students outside to observe trees, flags, and structures. Predict and test how leaves, swings, or paper sway in wind using a portable fan. Sketch before-and-after changes and vote on strongest effects as a group.

30 min·Whole Class

Pairs Test: Fan vs Natural Wind

Pairs build matching streamers, then compare movement in natural wind versus a classroom fan. Note differences in speed and direction on a T-chart. Present findings to class with photos or drawings.

25 min·Pairs

Real-World Connections

• Meteorologists use sophisticated instruments like anemometers and wind vanes, along with weather balloons and satellite data, to track wind patterns and forecast weather for communities across Canada.
• Sailors and pilots rely on accurate wind speed and direction information to navigate ships and aircraft safely and efficiently, making decisions based on real-time weather reports.
• Engineers consider wind loads when designing tall buildings and bridges, ensuring structures can withstand strong gusts and prevent damage.

Assessment Ideas

Exit Ticket

Provide students with a diagram of a simple house and tree. Ask them to draw arrows showing wind direction and add labels indicating 'light wind' and 'strong wind' effects on the house and tree.

Discussion Prompt

After students have built and tested their wind vanes, ask: 'What did your wind vane tell you about the wind today? If you built a different tool to measure wind speed, what did it show? How are these tools similar or different?'

Quick Check

Observe students as they construct their wind vanes. Ask guiding questions such as: 'What part of your vane shows the wind direction? How do you know which way the wind is blowing?'

Frequently Asked Questions

How do you explain what causes wind to grade 2 students?

Use a balloon model: heat air inside to make it rise, cool air rushes in. Relate to sun-warmed playground versus shady spots. Students draw or act out hot air rising, then test with hand warmers and streamers. This builds from familiar feelings to pressure ideas over several lessons.

What simple tools can grade 2 use to measure wind?

Wind vanes from straws and arrows show direction. Pinwheels or cup-on-stick anemometers gauge speed by spin rate. Streamers compare strength visually. Provide kits, let students calibrate with fans, and track data on class graphs for patterns.

How can active learning help students understand wind?

Active tasks like building vanes and testing in real wind make air movement visible and personal. Predictions before outdoor trials spark curiosity, while group data collection shows variability. Reflections connect experiences to sun-heating causes, deepening retention over passive lessons.

What activities predict strong wind effects on objects?

Use fans on models: tissue trees, block buildings, yarn flags. Students predict sway or topple, test speeds, and redesign for stability. Outdoor walks extend to real trees and signs, with journals noting safety tips like securing loose items.