CBSE Class 8 Science Friction — Worksheets & PDF Download

Friction explains the opposing force that arises whenever two surfaces move against each other. Through this chapter, students learn why we can walk firmly or why a moving vehicle gradually stops. They grasp how surface roughness and object heaviness influence the degree of resistance encountered. The narrative distinguishes between the drag felt before movement starts, the opposition during sliding, and the minimal pushback during rolling, demonstrating why wheels ease transportation. While this invisible force is vital for gripping a pen or braking a bicycle, it also wastes energy by generating heat and wearing down parts. Consequently, the text details how we minimize this effect using oils and polished materials, alongside situations where we intentionally roughen surfaces to enhance grip. The idea of fluid drag acting on airplanes and boats ties these concepts directly to everyday reality.