Moving Things, People and Ideas

This chapter explains force and its occurrence. Here, we discuss the resultant force, effects of force and types of forces. It also classifies force as contact and non-contact forces, along with examples.

This chapter explains friction and its causes. It defines all different types of friction, with their advantages and disadvantages. It talks about ways to increase or reduce friction along with fluid friction and the factors affecting it.

This chapter explains the pressure and the way we can measure it. The pressure exerted by solids, liquids and gases is explained with the help of clear and simple examples using things of daily use. We will also learn about the monometer.

The chapter explains the concept of sound. It discusses the methods of producing sound by different objects, including humans, to communicate. We will also learn about the characteristics of different sounds and the method of propagation of sound.