Chapter 4 of physics typically covers topics related to forces and motion, including Newton's laws, friction, and circular motion.
To better understand Newton's laws of motion, it is important to practice solving problems and applying the laws to real-world situations. You can also use visual aids such as diagrams and animations to help visualize the concepts.
Static friction is the force that prevents two surfaces from sliding past each other when they are not in motion. Kinetic friction, on the other hand, is the force that acts between two surfaces in motion.
Centripetal force is the force that acts towards the center of a circular path and keeps an object moving in a circular motion. It is always directed perpendicular to the velocity of the object and is caused by the inward acceleration of the object.
The net force on an object is the sum of all the forces acting on it. To calculate it, you need to determine the magnitude and direction of each force and then add them together using vector addition. The resulting net force will determine the acceleration of the object according to Newton's second law of motion.