NCERT Solutions for Class 8 Science Chapter 11: Force and Pressure

In this chapter, we will study about force, whether it is a pull or a push. We will study the reasoning and the causes behind a force. We will also learn about the relationship between force and motion. We will also study about how force can change the shape of an object. The chapter also tells us about contact and non-contact forces. We will also study about pressure in this chapter. The chapter lists down examples of how gases and liquids exert pressure. The chapter concludes by giving us a brief explanation about atmospheric pressure.

• A push or a pull on an object is called force.
• A force is generated due to an interaction between two or more objects.
• We study about forces in the same and opposite directions.
• We will also study about the magnitude of a force.
• A force can also change the state of motion.
• A change in the speed of an object or the direction of motion of an object is known as a change in its state of motion.
• The chapter gives examples of how force can even change the shape of objects.
• Contact forces include muscular force and friction.
• Friction always moves in the opposite direction of motion.
• Non-contact forces include magnetic force, electrostatic force and gravitational force.
• Force acting on a unit area of the surface is called pressure.
• The chapter contains elaborate experiments to prove that liquid and gases can also exert pressure.
• The pressure exerted by air is known as atmospheric pressure.
• The pressure inside our bodies is equal to the atmospheric pressure outside it.