PHY9A Lecture Notes - Lecture 1: Electromagnetism, Fundamental Interaction, Normal Force
Document Summary
Forces are a fundamental concept in physics, and they describe the interactions between objects. A force can be defined as a push or a pull on an object, which can cause the object to accelerate or change its direction of motion. It is an attractive force that pulls objects towards each other, and it is directly proportional to the product of their masses and inversely proportional to the square of the distance between them. The gravitational force is responsible for the motion of planets, moons, and other celestial bodies in the universe: electromagnetic force, the electromagnetic force is a fundamental force that is responsible for the interaction between electrically charged particles. It is responsible for the behavior of atoms, molecules, and many other systems in the universe. It is a relatively weak force that is responsible for the decay of unstable particles: frictional force, frictional force is the force that opposes motion between two surfaces in contact with each other.
