Science (EVS K-5) · Class 3 · Travel · Term 3

Journeys on Water and in Air

Explore the world of boats, ships, aeroplanes, and helicopters that help us cross rivers, seas, and skies.

TL;DR:Get ready to explore beyond the roads! This topic will take your students on an amazing journey across water and through the air to discover the vehicles that make it possible.

• CBSE Learning Outcomes
• NCERT EVS Class 3: Theme - Travel

About This Topic

This topic, 'Journeys on Water and in Air', is a fundamental part of Environmental Studies (EVS) for Class 3, aligning with the NCF's goal of helping children explore and understand their immediate and wider environment. It expands the concept of transport beyond the familiar land-based vehicles, introducing learners to the modes of travel that connect communities across rivers, seas, and continents. The focus is on observation, identification, and comparison, which are key scientific skills for this age group. In the Indian context, this topic is highly relatable, from the simple boats used in rural rivers and the iconic houseboats of Kashmir to the massive cargo ships at ports like Mumbai and the aeroplanes connecting India's bustling metropolitan cities.

The curriculum encourages moving from the concrete to the abstract. Therefore, the lesson should begin with familiar examples like boats and progress to larger concepts like ships and aeroplanes. It provides an excellent opportunity to introduce very basic scientific principles in an accessible manner. For instance, the concept of floating can be explored through simple activities, laying the groundwork for understanding buoyancy later. Similarly, discussing how aeroplanes fly can spark curiosity about air and flight. The objective is not to delve into complex physics but to foster a sense of wonder and encourage students to ask questions about how these incredible machines work.

Key Questions

1. Compare a boat with a ship.
2. Explain why aeroplanes are used for long-distance travel.
3. Identify one vehicle that travels on water and one that travels in the air.

Learning Objectives

• Identify and name common vehicles for water and air travel.
• Differentiate between a boat and a ship based on size and purpose.
• Explain in simple terms why aeroplanes are used for fast, long-distance travel.
• Classify different vehicles based on their mode of transport: water or air.
• Describe the basic function of vehicles like boats, ships, aeroplanes, and helicopters.

Key Vocabulary

Transport	The system or means of moving people or goods from one place to another.
Vehicle	A machine, such as a car, boat, or aeroplane, used to transport people or goods.
Float	To rest on the surface of a liquid, like water, without sinking.
Engine	A machine that converts energy into mechanical force or motion to make a vehicle move.
Journey	The act of travelling from one place to another.

Watch Out for These Misconceptions

Common Misconception

All heavy things sink.

What to Teach Instead

The shape of an object is very important. A large, heavy ship floats because its hollow, bowl-like shape displaces a lot of water, which pushes back up and supports it. A small, heavy coin sinks because it cannot displace much water.

Common Misconception

Boats and ships are the same.

What to Teach Instead

Ships are much larger than boats. Ships are built to travel across vast oceans for long durations, carrying many people or large amounts of cargo. Boats are smaller and are typically used on rivers, lakes, or for short distances near the coast.

Common Misconception

Aeroplanes fly by flapping their wings like birds.

What to Teach Instead

Aeroplanes have fixed wings that do not flap. Their engines push them forward at a very high speed, and the special curved shape of the wings creates a force called 'lift' that pushes the plane upwards into the air.

Active Learning Ideas

Think-Pair-Share

Sink or Float Experiment

Provide small groups with a tub of water and various items like a leaf, a coin, a plastic bottle, and a small foil boat. Students predict whether each item will sink or float and then test their predictions, leading to a discussion on why large boats don't sink.

25 min·Small Groups

Think-Pair-Share

Paper Aeroplane Challenge

Each student designs and folds a paper aeroplane. Hold a class competition to see whose plane flies the farthest, followed by a discussion on what features might have helped the winning planes fly better.

30 min·Individual

Think-Pair-Share

Vehicle Sorting Game

Give pairs of students a set of picture cards showing various vehicles (car, boat, ship, bus, aeroplane, helicopter). They must work together to sort the cards into three categories: Land, Water, and Air.

15 min·Pairs

Real-World Connections

• Using ferries and boats to cross rivers or visit islands, like the ferry services in Mumbai or the backwaters of Kerala.
• Seeing large cargo ships at major Indian ports like Chennai or Kolkata, which bring in goods like electronics and toys from other countries.
• Travelling by aeroplane to visit relatives in faraway cities like Delhi or Bengaluru, which saves a lot of time.
• Watching news reports of helicopters being used by the armed forces to rescue people during floods in states like Assam or Bihar.
• Enjoying a boat ride on a lake during a holiday, for example, at Nainital or Udaipur.

Assessment Ideas

Quick Check

Picture Sort: Give students pictures of various vehicles and ask them to sort them into 'Water' and 'Air' piles. Observe their choices and reasoning.

Exit Ticket

Draw and Label: Ask students to draw one water vehicle and one air vehicle, label them, and write one sentence about where each one travels.

Exit Ticket

Exit Ticket: Students complete the sentence stems: 'Today I learned about...' and 'I am still curious about...'.

Frequently Asked Questions

Why can't we take a small boat across the ocean?

Oceans have very large and powerful waves. Small boats are not strong or stable enough to handle such rough water and would be unsafe. Big ships are designed to be strong and steady, making them safe for long ocean journeys.

How can a helicopter stay in one place in the air?

A helicopter has large blades on top called rotors. By spinning these rotors at the right speed, the pilot can create just enough lift to balance the helicopter's weight, allowing it to hover in one spot without moving forward or backward.

What is the difference between an aeroplane and a helicopter?

An aeroplane needs a long runway to take off and land because it needs to build up speed for its wings to create lift. A helicopter's rotors allow it to take off and land vertically, straight up and down, so it doesn't need a runway.