Force, Pressure and Sound

This chapter defines the force and discusses its effects. We will be able to identify and describe different types of contact and non-contact forces that exist in nature. We will also learn 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 visual 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 visual illustrations. It lists some sources of noise pollution and ways to control it.