9Th Class Physics New Book Chapter 3 || Lecture 4 || Friction

This is the new book of class 9 physics published by pctb or punjab curriculum and textbook board lahore for all punjab boards and chapter 3 is about dynamics and types of forces like gravitational forces, electromagnetic forces, strong nuclear forces and weak nuclear forces and it also includes newtons first law of motion, second law of motion and third law of motion. this video includes various definitions of forces. #9thphysicsnew #9thpphysics