Moving Things, People and Ideas

This chapter defines force and discusses its effects. We will also learn about the different types of contact and non-contact forces that exist in nature. This chapter further explains in detail about pressure and its applications.

This chapter deals with the concept of friction and explains how it is caused. It states the advantages and disadvantages of friction and enables us to identify ways to increase and decrease frictional force with illustrations.

This chapter deals with the concept of sound, its characteristic features and explains how it is produced. It also discusses the working of a human ear in detail with illustrations. This chapter further explains about noise pollution and ways to control it.