Force and pressure introduces you to the term force through its application by describing day to day activities. The topics covered include definition and cause of force, the ability of a force to change direction and shape of objects, contact and non-contact forces, types of forces, and pressure exerted by substances and atmosphere.
Some of the important concepts covered in this chapter include the force of friction, factors affecting friction, wheels reduce friction, fluid friction, increasing and reducing friction, types of friction, application of friction and disadvantages of frictional force.
This chapter will help you understand what sound is, how it is produced and how sound and waves are interlinked with each other. This chapter teaches you why sound plays an important role in our everyday life.
It tells you that metals are good conductors and non-metals are bad conductors of electricity. It teaches you all about an electric circuit, how liquids conduct electricity, electric circuit, chemical effects of electric current, electroplating and applications of electroplating.
In this chapter we will be learning about some natural phenomena like lightning, earthquakes. The topics covered are lightning, charging by rubbing, types of charges and their interaction, transfer of charge, lightning safety, lightning conductors, the meaning of earthquakes, protection from earthquakes, causes of earthquakes, structure of the earth, and power of the earthquake.
This chapter also teaches you how we use our sense of vision to differentiate among the objects. It teaches you the fundamental concepts in this chapter through examples of birds, stars and moon and discusses the physiology of our eyes, multiple reflections, laws of reflection, and the properties of light.