Physics

Sound plays an important role in our lives. It helps us communicate with one another. This chapter provides an explanation about how sound is produced, how it travels from one place to another and how human produce sound.

This chapter discusses the chemical effects of electric current. The passage of electric current through a conducting liquid causes chemical reactions. The resulting effects are called chemical effects of electric current.

This chapter discusses force and pressure. It defines force and describes the types of force. It explains how a force changes the state of motion. It also explains the pressure exerted by liquid and gases and atmospheric pressure.

This chapter describes in detail the properties of light. It also explains its reflection in mirrors, and images formed by lenses.

Any object moving over the surface of another object slows down when no external force is applied on it and finally it stops. It is due to friction. This chapter explains the various concepts related to friction in detail.

The stars, the moon, the planets and many other objects in the sky are called celestial objects. This chapter discusses the Sun, the moon and other heavenly bodies. It also explains the solar system, constellations and artificial satellite in detail.

This chapter discusses two destructive natural phenomena; lightning and earthquakes. It also discusses the steps to minimise destruction caused by these phenomena.