Science (EVS K-5) · Class 6 · Motion and Measurement of Distances · Term 3

Understanding Rest and Motion

Define what it means for an object to be at rest or in motion by observing its position relative to its surroundings.

TL;DR:Have you ever noticed how a person sitting next to you on a bus seems still, but the trees outside are rushing past? This lesson explores this interesting idea of rest and motion, and how our point of view changes everything.

• CBSE Learning Outcomes
• NCERT Class 6 Science: Chapter 10 - Motion and Measurement of Distances

About This Topic

This topic introduces the foundational concepts of mechanics: rest and motion. As per the NCERT framework for Class 6 Science, this chapter, typically under 'Motion and Measurement of Distances', aims to build an intuitive understanding of these concepts through observation. The core idea to be established is that rest and motion are not absolute but relative states. An object's state of rest or motion depends entirely on the observer's frame of reference. For instance, a book on a table is at rest with respect to the room, but it is in motion with respect to the Sun, as the Earth itself is moving.

The pedagogical approach should be activity-based, encouraging students to observe their immediate surroundings like the classroom, playground, and their journey to school. This helps them grasp the abstract idea of a 'reference point' or 'surroundings' in a concrete manner. This topic serves as a crucial stepping stone for later concepts in physics, such as types of motion (rectilinear, circular, periodic), speed, and eventually, the laws of motion in higher classes. The focus at this stage is purely qualitative, avoiding mathematical calculations and focusing on clear definitions and relatable examples.

Key Questions

1. Explain how you can determine if an object is in motion.
2. Compare an object at rest with an object in motion, using examples from your surroundings.
3. Identify objects in the classroom that are at rest and in motion relative to you.

Learning Objectives

• Define the terms 'rest' and 'motion' with examples.
• Explain that rest and motion are relative and depend on the observer's frame of reference.
• Identify a suitable reference point to describe the state of an object.
• Differentiate between objects at rest and in motion in their immediate surroundings.
• Provide examples of objects that can be considered at rest and in motion simultaneously.

Key Vocabulary

Rest	The state of an object when its position does not change with time, with respect to its surroundings.
Motion	The state of an object when its position changes continuously with time, with respect to its surroundings.
Reference Point	A fixed object or a place used to describe the position or motion of another object.
Position	The specific location of an object.
Relative	Dependent on or compared to something else; not absolute.

Watch Out for These Misconceptions

Common Misconception

An object is either moving or it is not. Motion is an absolute state.

What to Teach Instead

Motion is always relative. An object can be at rest with respect to one thing and in motion with respect to another. For example, a passenger on a bus is at rest relative to their seat, but in motion relative to a tree on the roadside.

Common Misconception

If I cannot see something moving, it must be at rest.

What to Teach Instead

Some motions are too slow to be easily seen, like the movement of a clock's hour hand or a plant growing. Also, we are always moving with the Earth as it spins, but we don't feel it because everything around us is also moving with it.

Common Misconception

Non-living things cannot move by themselves.

What to Teach Instead

While non-living things need an external force to start moving, the state of being in motion is simply a change in position. A rolling ball or a flowing river are examples of non-living things in motion.

Active Learning Ideas

Experiential Learning

Reference Point Tag

One student is the 'observer' and stands still. Other students move around. The observer calls out another student's name and describes their motion relative to a fixed object, like 'Ria is moving away from the blackboard'.

15 min·Whole Class

Experiential Learning

The Moving Dot

Students draw a dot on a piece of paper. They then move the paper across their desk. Ask them: 'Is the dot moving relative to the paper? Is it moving relative to the desk?'

10 min·Individual

Experiential Learning

Train Journey Simulation

Arrange chairs in rows like a train carriage. Some students are 'passengers' and one walks down the 'aisle'. Discuss who is in motion and who is at rest relative to the train and relative to the classroom floor.

20 min·Small Groups

Real-World Connections

• Describing a car's movement on a road using trees or buildings as reference points.
• Tracking the location of a train on a railway map to know its progress.
• In sports like cricket, observing the motion of the ball relative to the batsman and the wickets.
• Using GPS on a mobile phone, which tracks your phone's motion relative to satellites.
• Observing the movement of the moon and stars in the night sky relative to a fixed point on the horizon.

Assessment Ideas

Exit Ticket

Use an exit ticket. Ask students to write down one example of an object at rest and one of an object in motion from the classroom, and to name the reference point for each.

Quick Check

Provide a picture of a busy street scene. Ask students to list three objects in motion and three objects at rest, explaining their reasoning for each.

Quick Check

Students complete a simple checklist: 'I can define rest', 'I can define motion', 'I can explain why motion is relative with an example'.

Frequently Asked Questions

If I am sitting still in my chair, am I at rest or in motion?

You are at rest with respect to the chair and the room. But you are in motion with respect to the Sun, because you are on the Earth, and the Earth is constantly moving.

What is a reference point and why is it important?

A reference point is a fixed object or place that we use to judge if something else has moved. It is important because without it, we cannot say for sure if an object has changed its position.

Are the blades of a moving fan at rest or in motion?

The blades are in motion with respect to the ceiling and the room. However, a small sticker placed on one blade is at rest with respect to that blade, as its position on the blade does not change.