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ICSE Class 6 Science★ ICSE Class 6 Science · Physics & Chemistry: Matter, Measurement, Force and Energy

Matter, Measurement, Force & Energy (Physics)

Everything is made of MATTER. How do we MEASURE things? What is FORCE? And what is ENERGY — the invisible power that makes everything happen? ICSE Class 6 Physics.

⏱ 16 min readEasy difficulty✓ Free · NCERT-aligned

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By the end of this chapter you'll be able to…

1State and distinguish the three states of matter by shape, volume, and particle arrangement
2Name the four fundamental physical quantities and their SI units
3List and illustrate the four effects of force on objects
4Classify forces as contact (muscular, friction) or non-contact (magnetic, gravitational, electrostatic)
5Name six forms of energy and give one real-life example of each
6Explain energy transformation with two everyday examples
7Distinguish luminous from non-luminous objects; explain how shadows form
8Describe a solar and a lunar eclipse with a labelled diagram description
9State the two laws of magnetism

💡

Why this chapter matters

This chapter lays the vocabulary and conceptual foundation for all of ICSE Physics and Chemistry. The three states of matter and their particle behaviour underpin Class 7–10 chemistry (solutions, acids, metals). Fundamental physical quantities and SI units appear in every ICSE Physics numerical from Class 7 onwards. Force types (especially friction and gravity) and energy forms are directly examined in ICSE Class 8 and 9 Physics. Mastering these definitions and distinctions now prevents confusion when quantities get mathematically complex later.

Before you start — revise these

A 5-minute refresher here will save you 30 minutes of confusion below.

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Class 5 Science: Basic properties of materials

Familiarity with hard/soft, rough/smooth; ICSE Class 6 formalises these into states and forces

Physics — Matter, Measurement, Force & Energy

1. Matter

What Is Matter?

Anything that has MASS and occupies SPACE is matter. Everything around you — the air you breathe, the water you drink, the chair you sit on — is matter.

States of Matter

State	Shape	Volume	Arrangement of Particles
Solid	Fixed	Fixed	Tightly packed, vibrate in place
Liquid	Takes shape of container	Fixed	Loosely packed, can slide past each other
Gas	Fills entire container	Not fixed	Very loose, move freely and fast

Changes of State

Melting: Solid → Liquid (ice → water). Heat GAINED.
Freezing: Liquid → Solid (water → ice). Heat LOST.
Evaporation: Liquid → Gas (water → vapour). Heat GAINED.
Condensation: Gas → Liquid (vapour → water). Heat LOST.

2. Physical Quantities and Measurement

What Is Measurement?

Measurement = A NUMBER + A UNIT. 'The table is 2 METRES long.'

Fundamental Quantities

Quantity	SI Unit	Symbol
Length	metre	m
Mass	kilogram	kg
Time	second	s
Temperature	kelvin	K

Measuring Length

Small objects: RULER (centimetres, millimetres). 1 cm = 10 mm.
Long distances: Measuring tape, metre scale. 1 m = 100 cm. 1 km = 1,000 m.

Measuring Mass

Beam balance (laboratory). Electronic balance (modern).
1 kg = 1,000 g.

Measuring Time

Stopwatch. Clock.
1 min = 60 s. 1 hour = 60 min = 3,600 s.

Measuring Temperature

Thermometer. Celsius (°C) scale.
Water FREEZES at 0°C. Water BOILS at 100°C.

3. Force

What Is Force?

A PUSH or a PULL. Force can: (a) make an object MOVE, (b) STOP a moving object, (c) CHANGE the direction, (d) CHANGE the shape.

Effects of Force

A football KICKED → moves (change in state of motion)
A ball STOPPED by a goalkeeper → stops
A spring STRETCHED → changes shape

Types of Force

Type	Examples
Muscular	Lifting, pushing, pulling — using your MUSCLES
Friction	Resists motion. Rubbing hands. Brakes on a bicycle.
Magnetic	Attracts or repels magnetic materials
Gravitational	Earth pulls everything TOWARD it. Weight = force of gravity on mass.
Electrostatic	Rubbing a balloon on hair → attracts paper bits

4. Energy

What Is Energy?

The CAPACITY to do WORK. Energy is NEVER created or destroyed — it only CHANGES FORM (Law of Conservation of Energy).

Forms of Energy

Form	Example
Kinetic	Moving car, flowing water, wind
Potential	Stretched rubber band, water in a dam
Heat/Thermal	Sun, fire, hot water
Light	Sun, bulb, candle
Sound	Drum, bell, voice
Electrical	Wires, batteries

Energy Transformation

Electric fan: Electrical → Kinetic
Solar panel: Light → Electrical
Burning wood: Chemical → Heat + Light

5. Light

Sources of Light

Natural: Sun, stars, fireflies
Artificial: Bulb, candle, torch, LED

How We See

Light from a source hits an object → bounces off (REFLECTION) → enters our EYES → we SEE.

Shadows

A shadow forms when an OPAQUE object blocks light. Shadow needs: (a) Source of light, (b) Opaque object, (c) Screen (wall/ground).

Solar Eclipse

Moon comes BETWEEN the Sun and Earth. Moon's shadow falls on Earth.

Lunar Eclipse

Earth comes BETWEEN the Sun and Moon. Earth's shadow falls on the Moon.

6. Magnetism

Magnets

A magnet ATTRACTS materials like IRON, NICKEL, and COBALT.

Poles

Every magnet has TWO poles: NORTH and SOUTH.
LIKE poles REPEL. UNLIKE poles ATTRACT.
A freely suspended magnet aligns NORTH-SOUTH (compass principle).

Earth as a Magnet

The Earth itself is a GIANT MAGNET. Its magnetic North is near the geographic South Pole. A compass needle points North because it aligns with Earth's magnetic field.

Key formulas & results

Everything you need to memorise, in one card. Screenshot this for revision.

States of matter — comparison

Solid: fixed shape + fixed volume · Liquid: no fixed shape + fixed volume · Gas: no fixed shape + no fixed volume

Particle spacing: Solid (tightly packed) < Liquid (loosely packed) < Gas (very spread out).

Four fundamental physical quantities

Length → metre (m) · Mass → kilogram (kg) · Time → second (s) · Temperature → kelvin (K)

All other physical quantities are derived from these four. Celsius (°C) is used in everyday life but kelvin is the SI unit for temperature.

Four effects of force

Force can: (1) move a stationary object · (2) stop or slow a moving object · (3) change the direction of motion · (4) change the shape of an object

A single force can produce more than one effect simultaneously (e.g. a cricket bat hitting a ball: changes direction AND speed).

Five types of force

Muscular (contact, living beings) · Friction (contact, opposes motion) · Magnetic (non-contact, poles) · Gravitational (non-contact, mass attraction) · Electrostatic (non-contact, charged objects)

Contact forces require physical touch; non-contact forces act at a distance.

Six forms of energy

Kinetic (moving objects) · Potential (stored: gravitational/elastic/chemical) · Heat (thermal) · Light · Sound · Electrical

Energy is never created or destroyed — only converted from one form to another (Law of Conservation of Energy).

Energy transformation chain

Torch: Chemical → Electrical → Light · Loudspeaker: Electrical → Sound · Hydroelectric dam: Gravitational Potential → Kinetic → Electrical

Every transformation loses some energy as heat — that is why no machine is 100% efficient.

Shadow formation rule

Shadow forms when an OPAQUE object blocks LIGHT from a luminous source; shadow appears on the OPPOSITE side from the source

Transparent objects form no shadow; translucent objects form faint shadows.

Solar vs Lunar eclipse

Solar eclipse: Moon between Earth and Sun (daytime, new moon) · Lunar eclipse: Earth between Sun and Moon (night, full moon)

Solar eclipses are rare at any given location; lunar eclipses are visible from half the Earth's surface simultaneously.

Laws of magnetism

Like poles REPEL · Unlike poles ATTRACT · Earth itself is a giant magnet (geographic North ≈ magnetic South)

A freely suspended magnet always aligns North–South — the principle behind a compass.

⚠️

Common mistakes & fixes

These are the exact errors that cost students marks in board exams. Read them once, save yourself the trouble.

WATCH OUT

✗ Saying a liquid has 'no fixed shape AND no fixed volume'

✓ Only GAS has no fixed shape AND no fixed volume. A liquid has no fixed shape (takes the shape of its container) but DOES have a fixed volume — 500 mL of water stays 500 mL whether in a bottle or a bowl.

WATCH OUT

✗ Calling gravity a 'contact force'

✓ Gravity acts between any two masses without touching — it is a NON-CONTACT force. You feel Earth's gravity even when jumping. Contact forces (muscular, friction) require physical touch.

WATCH OUT

✗ Confusing solar and lunar eclipses — mixing up which body is in the middle

✓ Think of the order in space: Sun–Moon–Earth = Solar eclipse (Moon in the middle, blocks Sun). Sun–Earth–Moon = Lunar eclipse (Earth in the middle, blocks sunlight from the Moon). The middle body is always the blocker.

WATCH OUT

✗ Writing 'Celsius' as the SI unit of temperature

✓ The SI unit of temperature is KELVIN (K), not Celsius. Kelvin starts at absolute zero (−273°C). ICSE exam questions asking for 'SI unit of temperature' expect kelvin.

Practice problems

Try each one yourself before tapping "Show solution". Active recall > rereading.

Q1EASY· states-of-matter

Rohit pours 200 mL of water into a round bowl and then into a rectangular container. Does the volume change? Does the shape change? Which state of matter does water represent?

▶ Show solution

✦ Answer: Volume: 200 mL remains 200 mL in both containers — volume does NOT change. Shape: water takes the shape of whichever container it is in — shape DOES change. Water is a LIQUID. Key property: liquids have a fixed volume but no fixed shape.

Q2EASY· fundamental-quantities

A student measures: length of a table (3 m), mass of a book (0.5 kg), time to read a chapter (20 min). Identify the physical quantity and SI unit for each. Is 'minute' an SI unit of time?

▶ Show solution

✦ Answer: Length of table → Physical quantity: Length → SI unit: metre (m). Mass of book → Physical quantity: Mass → SI unit: kilogram (kg). Time to read → Physical quantity: Time → SI unit: second (s). 'Minute' is NOT the SI unit of time. 20 minutes = 1200 seconds.

Q3EASY· effects-of-force

A goalkeeper kicks a ball already moving toward her goal, redirecting it out of play. How many effects of force are demonstrated? Name them.

▶ Show solution

✦ Answer: TWO effects are demonstrated simultaneously. (1) Changing the direction of motion — the ball's path is deflected away from the goal. (2) Changing the speed — the force from the kick changes how fast the ball moves.

Q4EASY· types-of-force

Classify each as (i) contact or non-contact and (ii) name the force type: (a) Gravity pulls a book down. (b) A comb rubbed on hair attracts paper bits. (c) A child pushes a swing.

▶ Show solution

✦ Answer: (a) Gravity: NON-CONTACT force. Type: GRAVITATIONAL force. (b) Comb attracting paper: NON-CONTACT force. Type: ELECTROSTATIC force (static electricity built up by rubbing). (c) Child pushing swing: CONTACT force. Type: MUSCULAR force.

Q5EASY· energy-forms

Name the form(s) of energy present in each: (a) an arrow held in a stretched bow, (b) a fan rotating with its motor running, (c) a log burning in a fireplace.

▶ Show solution

✦ Answer: (a) Stretched bow: ELASTIC POTENTIAL energy stored in the bow; arrow has GRAVITATIONAL POTENTIAL energy (ready to convert to kinetic when released). (b) Rotating fan: KINETIC energy (blades moving) + ELECTRICAL energy consumed by motor. (c) Burning log: CHEMICAL energy → HEAT energy + LIGHT energy.

Q6EASY· energy-transformation

Trace the energy transformation in a hydroelectric power station, starting from water stored in a dam.

▶ Show solution

✦ Answer: Water stored at height → GRAVITATIONAL POTENTIAL energy. Water falls through pipes → KINETIC energy. Moving water spins turbines → MECHANICAL (kinetic) energy. Turbines drive generators → ELECTRICAL energy. Electrical energy reaches homes → LIGHT, HEAT, SOUND energy in appliances. Full chain: Gravitational Potential → Kinetic → Electrical → Light/Heat/Sound.

Q7MEDIUM· eclipses

Explain why solar eclipses are less commonly seen from any given location than lunar eclipses, even though solar eclipses happen slightly more often per year globally.

▶ Show solution

✦ Answer: A solar eclipse occurs when the Moon's shadow (umbra) falls on Earth. The Moon is small compared to the Sun, so its umbra covers only a narrow strip of Earth's surface (a few hundred km wide). Only people in that strip see the total solar eclipse. A lunar eclipse occurs when Earth's shadow falls on the Moon. Earth is much larger than the Moon, so its shadow covers the entire Moon — visible to anyone on the night-side (half the planet) simultaneously. Conclusion: Solar eclipses happen globally but fall on tiny strips of land; lunar eclipses are visible to billions at once. So while solar eclipses may be globally more frequent, the chance of being in the right narrow path is very low.

Q8EASY· magnetism

Aisha places the north pole of a magnet near the south pole of another magnet, then near a north pole. Describe what happens in each case and state the law used.

▶ Show solution

✦ Answer: Case 1 (North near South): Magnets ATTRACT and pull together. Law: Unlike poles attract. Case 2 (North near North): Magnets REPEL and push apart. Law: Like poles repel.

5-minute revision

The whole chapter, distilled. Read this the night before the exam.

•Three states of matter: Solid (fixed shape + fixed volume) · Liquid (no fixed shape + fixed volume) · Gas (no fixed shape + no fixed volume).
•Four fundamental quantities and SI units: Length (m), Mass (kg), Time (s), Temperature (K). Kelvin is the SI unit for temperature — NOT Celsius.
•Four effects of force: move a stationary object, stop a moving object, change direction of motion, change shape of object.
•Five force types: Muscular and Friction are CONTACT forces. Magnetic, Gravitational, and Electrostatic are NON-CONTACT forces.
•Six energy forms: Kinetic, Potential (gravitational/elastic/chemical), Heat, Light, Sound, Electrical.
•Energy is NEVER created or destroyed — only transformed. Law of Conservation of Energy.
•Shadow: formed when an OPAQUE object blocks LIGHT. Transparent = no shadow; Translucent = faint shadow.
•Solar eclipse: Sun–Moon–Earth (Moon blocks Sun). Lunar eclipse: Sun–Earth–Moon (Earth's shadow on Moon).
•Laws of magnetism: Like poles REPEL; Unlike poles ATTRACT.
•A freely suspended magnet aligns N–S because Earth behaves like a giant magnet — the basis of a compass.

ICSE marks blueprint

Where the marks come from in this chapter — so you can plan your prep.

Typical chapter weightage: 20–25 marks (in 80-mark ICSE Class 6 Science annual paper)

Question type	Marks each	Typical count	What it tests
MCQ / Fill-in-the-blank	1	4–5	SI units, force contact/non-contact, eclipse order, laws of magnetism
Short answer (List/State)	2–3	3–4	States of matter differences, four effects of force, six energy forms, shadow formation
Diagram	3–4	1	Draw solar/lunar eclipse diagram with labelled positions of Sun, Moon, Earth
Long answer (Explain)	5	1	Energy transformation chain, or classify and explain all five force types

Prep strategy

States of matter: practise the 3-row comparison table (solid/liquid/gas) with shape and volume for each
Four fundamental quantities + SI units: Length/m, Mass/kg, Time/s, Temperature/K — kelvin NOT Celsius
Force classification: practise sorting 10 examples into contact vs non-contact. The trap is gravity — always non-contact
Energy forms: write 6 forms + one real-life example each as a quick-recall list
Eclipse diagram: practise drawing Sun–Moon–Earth (solar) and Sun–Earth–Moon (lunar) with shadow directions
Magnetism laws: like repels, unlike attracts — two facts, two marks

Where this shows up in the real world

This chapter isn't just an exam topic — it lives in the world around you.

SI units in science and medicine

Doctors, pharmacists, and scientists worldwide use SI units so measurements are universally understood. Medicines dosed in mg, temperatures in kelvin in chemistry labs — all trace back to the four fundamental quantities.

Friction in vehicle safety

Car tyres have grooves (treads) to maximise friction with wet roads. Braking distance depends on friction between tyres and road — understanding friction is essential for road safety engineering and accident prevention.

Energy transformation in daily appliances

Every appliance converts energy: microwave (electrical → heat), speaker (electrical → sound), solar panel (light → electrical). Understanding energy transformation helps engineers design more efficient devices and reduce electricity waste.

Compass and navigation

Ships, aeroplanes, and hikers use magnetic compasses based on Earth's magnetic field. Even though GPS has largely replaced compasses, GPS satellites still use the same principle that Earth and magnets have poles.

Exam strategy

Battle-tested tips from teachers and toppers for this chapter.

For 'classify the force' questions: always ask yourself 'does it need touching?' Contact = muscular/friction; Non-contact = gravity/magnetic/electrostatic.
For energy transformation questions: write a clear CHAIN with arrows (→). Examiners give marks for each correct step, not just the final answer.
When asked for 'SI unit': never write Celsius for temperature or kilometre for length — the correct answers are kelvin and metre respectively.
For eclipse questions: draw a diagram — you get marks for the diagram itself (correct order, labelled shadows). Write Sun–Moon–Earth for solar; Sun–Earth–Moon for lunar.
For 'state one difference' questions: write as a two-column table — examiners find this easier to mark and you are less likely to mix up the two things you are comparing.

Going beyond the textbook

For olympiad aspirants and curious learners — topics that build on this chapter.

Research the four fundamental forces of nature: gravitational, electromagnetic, strong nuclear, and weak nuclear. How do they differ from the 5 everyday forces you learned in Class 6?
What is absolute zero (0 K, −273.15°C)? Why is it theoretically impossible to cool anything below absolute zero? Research superconductors and superfluids near absolute zero.
Plasma is sometimes called the 'fourth state of matter' — found inside the Sun and in lightning. Research what plasma is and why it behaves differently from a gas.
Investigate potential energy types in depth: gravitational PE (PE = mgh), elastic PE (½kx²), chemical PE (stored in bonds). How does a rechargeable battery store and release chemical potential energy?

Where else this chapter is tested

CBSE board isn't the only one — other exams test this chapter too.

ICSE Class 6 Science Annual ExaminationDirect — Matter, Force, and Energy is core syllabus content tested in every Class 6 ICSE Science paper

ICSE Class 8 Physics: Force and PressureDirect continuation — force types and effects are extended to pressure, buoyancy, and Newton's Laws

ICSE Class 9 Physics: Laws of MotionFoundation — Newton's three laws build directly on the force effects and types studied here

ICSE Class 10 Physics: Work, Energy and PowerDirect extension — energy forms and transformations are formalised with equations (W=Fd, KE=½mv²)

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Questions students ask

The real ones — pulled from the Q&A community and tutor sessions.

Water can exist in all three states depending on temperature: solid ice (below 0°C), liquid water (0–100°C), and steam/gas (above 100°C). The state changes when heat is added or removed — the substance is still H₂O, but particle arrangement and movement changes.

Mass is the amount of matter in an object — stays the same everywhere (SI unit: kg). Weight is the gravitational force on that mass — changes on the Moon or other planets (SI unit: newton). On the Moon, your mass is the same but weight is 1/6th of what it is on Earth.

No — friction is essential for walking (prevents slipping), writing (pen on paper), braking a car, and lighting a matchstick. Friction is undesirable in machine parts where it causes wear and heat — that is why lubricants (oil) are used.

No. The Law of Conservation of Energy states energy can only be CONVERTED from one form to another — never created from nothing and never destroyed. When a phone battery 'runs out,' the electrical energy has been converted to light, sound, and heat.

The Sun's dangerous ultraviolet and infrared radiation is still present during an eclipse. The Moon only blocks visible light, making it seem safe. But invisible radiation damages the retina permanently — special eclipse glasses with solar filters are needed.

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Matter, Measurement, Force & Energy (Physics)

By the end of this chapter you'll be able to…

Before you start — revise these

Physics — Matter, Measurement, Force & Energy

1. Matter

What Is Matter?

States of Matter

Changes of State

2. Physical Quantities and Measurement

What Is Measurement?

Fundamental Quantities

Measuring Length

Measuring Mass

Measuring Time

Measuring Temperature

3. Force

What Is Force?

Effects of Force

Types of Force

4. Energy

What Is Energy?

Forms of Energy

Energy Transformation

5. Light

Sources of Light

How We See

Shadows

Solar Eclipse

Lunar Eclipse

6. Magnetism

Magnets

Poles

Earth as a Magnet

Key formulas & results

Common mistakes & fixes

Practice problems

5-minute revision

ICSE marks blueprint

Where this shows up in the real world

Exam strategy

Going beyond the textbook

Where else this chapter is tested

AI helpers for this chapter

Generate 5 more questions

Explain at a different level

📝 My notes

Questions students ask

Why is water called a liquid if it turns into ice and steam?

What is the difference between mass and weight?

Is friction always bad?

Can energy be created from nothing?

Why can't we look directly at a solar eclipse?

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Elements, Compounds, Water & Air (Chemistry)

Plant Life, Cells, Human Body & Health (Biology)

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