Physics Essay Example | Topics and Well Written Essays - 1250 words - 1

Physics - Essay Example With relation to topic of World, physics encompasses essentially all of nature including the laws and properties of matter and the forces acting upon them. Especially the causes, that modify the general properties of bodies, like light, magnetism, electricity, quantum effects, gravity etc. Physics studies every motion, from objects as small as neutrons to as massive as planets. It also studies the forces, and the interactions between bodies. It is the study of the most fundamental interactions between time, space, energy and matter. "We have sought for firm ground and found none. The deeper we penetrate, the more restless becomes the universe, all is rushing about and vibrating in a wild dance."(Max Born) Physics answers these and many such questions. Let us consider our last question, we often wonder why an object in motion stops suddenly, it is due to the Frictional force. There are many things in this world that makes the presence of Friction felt. For example, when we try to push a table across a room, we experience a resisting force which makes our work much more difficult, and this is the frictional force. It is a well known phenomenon in the universe that any bod... . Physics answers these and many such questions. Let us consider our last question, we often wonder why an object in motion stops suddenly, it is due to the Frictional force. There are many things in this world that makes the presence of Friction felt. For example, when we try to push a table across a room, we experience a resisting force which makes our work much more difficult, and this is the frictional force. FRICTION: It is a well known phenomenon in the universe that any body which is in state of motion on any plane, left to itself automatically comes to rest after traveling through some distance, this is due to Friction. It is the resistive force acting between bodies that tends to oppose and damp out motion. Types of friction: 1. Static friction 2. Kinetic/dynamic friction 3. Rolling Friction Static friction: The Static force of friction ( fs ) is the force of friction between two objects when there is no motion. Consider a block' B' which is resting on a horizontal table. Let a small pan be attached the block by means of a horizontal thread passing over a smooth frictionless pulley. When the weight in the pan is less, the block does not move because the pulling force or applied force' p' is balanced by the frictional force' f' which is called static friction.. If the weight in the pan increases further then the block tends to slide over the surface. At this stage the force of friction also reaches a maximum value called limited friction. Thus the maximum or limiting value of force of friction that comes into play when the body just begins to slide over the surface of another body is known as Limiting Friction. Dynamic Friction or Kinetic Friction: The Kinetic force of friction ( fk ) is the force of friction between two objects