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Class VIII – Physical Science

chapter Topics in the syllabus 

1 Force

• What is force
• Types of forces

Ø Magnetic force

Ø Electrostatic force

Ø Gravitation

• Contact force

Ø Muscular force

Ø Force of friction

Ø Normal force

Ø Tension

• Net force
• Pressure

2 Friction

• Force of friction – types
• Factors affecting friction
• Is friction necessary?
• Increasing the decreasing friction
• Fluid friction.

3 Synthetic Fibres and Plastics

• Clothes made of natural fibres
• what is synthetic fibre?
• Some synthetic fibres

Ø Nylon

Ø Rayon

Ø Acrylic

Ø Why synthetic fibres?

Ø Polyesters

• Plastics around us

Ø What is plastic?

Ø Types of plastics

Ø Thermoplastics

Ø Thermosetting plastics

Ø Why do we prefer plastics?

Ø Plastic and environment

• Reduce, Recycle, Reuse and

Recover – 4R principle

4 Metals and Non- Metals

• Introduction
• Physical Properties

Ø Appearance

Ø Sonority

Ø Malleability

Ø Ductility

Ø Electrical Conductivity

Chemical properties of metals and non – metals, reactivity of metals.

• Chemical properties of metals and non-metals

Ø Reaction with Oxygen

Ø Rusting of metals

Ø Reaction with water

Ø Reactivity of metals

• Some uses of non-metals
• Uses of metals

5 Sound

• Production of sound
• Musical instruments
• Sound produced by human beings
• Propagation of sound

Ø Sound needs a medium to propagate

Ø Propagation of sound in different media

• How do we hear sound?

Ø Structure and functioning of the eardrum

• Characteristics of sound

Loudness, feebleness and amplitude

• Normal sound consists of mixed frequencies

• Noise and music
• Audible range
• Sound pollution.

Ø Effects of sound pollution

Ø Measures to control sound pollution

6 Reflection of Light at Plane Surfaces

• Plane mirror
• Reflection of light by plane mirrors
• Pin hole camera, , formation of an image by a plane mirror, characteristics of an

image formed by a plane mirror.

7 Coal and Petroleum

• Introduction
• Source of materials

Ø Exhaustible and inexhaustible resources

• Coal, petroleum and natural gas as fuels

• Some petrochemical products
• Natural gas and petrochemicals

• versatile nature of coal and petroleum

• conserving coal and petroleum

• Misuse of energy resources and consequences

8 Combustion, Fuels and Flame

• Introduction
• What is needed for the process of combustion?
• Ignition temperature
• Types of combustion
• Fuels
• Fire control
• Flame
• Structure of flame

9. Electric Conductivity of Liquids

• Testing the material to know which allows electric current to pass through

• Electrical conductivity of liquids

• Transforming a poor electric conductor into a good one

• Chemical effects of electric current

• Electrolytic cell
• Electroplating.

10 Some Natural Phenomena

• Lighting, Charging by rubbing
• Types of charges and their interaction

• lighting – safety measures.

11 Stars and Solar System

• Introduction, observing shadow length, sundial
• The phases of the moon
• Solar eclipse
• Lunar eclipse
• know something about stars
• The solar system
• How people know earth is spherical

• Earth rotates on its own axis

– Artificial Satellites

12 Graphs of Motion

• A graph is a not a matter
• relation between speed and the slow of a graph

• graph of non uniform motion
• the graph of a story