PHYSICS NOTES 24X7

Q1- What is the difference between a conductor and an insulator?  Answer : A conductor allows current to flow easily through it. Insulators don't allow current to flow through it. Electric charges are absent in insulator. Conductors are used in making electrical equipment. Q2-What is electric current? Answer : Electric Current is the rate of flow of electrons in a conductor. The SI Unit of electric current is the Ampere. Electrons are minute particles that exist within the molecular structure of a substance. Sometimes, these electrons are tightly held, and other times they are loosely held. Q3-What is potential difference? Give its unit with definition. Answer : The amount of work done in moving a unit charge from one point to another is defined as the potential difference between any two points. Potential difference can be written as v = w Q . Here, w is work done and Q is charge. Volt is the SI unit of potential difference (V). Q4-What are the disadvantages of heating effect of c

Impulsive forces are   huge forces acting on a body for a short period of time causing drastic momentum changes . The SI unit of impulse is   Newton-seconds (Ns) or kg m/s . Example of Impulsive Force

  Heat energy is called Heat. When an object is very hot, it generally possesses a lot of heat energy; similarly, when the object is cold, it has less heat energy.  Transmission of Heat The heat can be transferred from one place to another in different ways- Conduction Conduction mostly happens in a solid-state. All liquids (except mercury) and gases are poor conductors of heat. When a solid heat up, its molecules gain kinetic energy and increase the energy with which they vibrate. Conduction occurs when heat energy travels through a body, passing from one particle to another particle as they vibrate against each other. A good conductor must have particles that are close enough together to collide with sufficient force for energy to be transferred from one place to another. Convection Convection is the way in which heat flows through liquids and gases. Take a vessel of cold liquid soup on your stove and put it on the stove. The soup in the bottom of the pan, closest to the heat, warms

  Born in 1643 in Woolsthorpe, England, Sir Isaac Newton began developing his theories on light, calculus and celestial mechanics while on break from Cambridge University. Years of research culminated with the 1687 publication of “Principia,” a landmark work that established the universal laws of motion and gravity. Force :  The push or pull on an object with mass causes it to change its velocity. Force is an external agent capable of changing a body's state of rest or motion. It has a magnitude and a direction. (or Push or Pull on an object is called Force.) Newton’s first law: the law of inertia Newton’s first law states that if a body is at rest or moving at a constant speed in a straight line, it will remain at rest or keep moving in a straight line at constant speed unless it is acted upon by a force. The law of inertia was first formulated by Galileo Galilei for horizontal motion on Earth and was later generalized by René Descartes. Although the principle of inertia i

Sir Issac newton Born in 1643 in Woolsthorpe, England, Sir Isaac Newton began developing his theories on light, calculus and celestial mechanics while on break from Cambridge University. Years of research culminated with the 1687 publication of “Principia,” a landmark work that established the universal laws of motion and gravity. What is Newton’s Second Law of Motion? Force is equal to the rate of change of momentum. For a constant mass, force equals mass times acceleration. Newton’s second law states that the acceleration of an object depends upon two variables. The net force acting on the object and the mass of the object.   The acceleration of the body is directly proportional to the net force acting on the body and inversely proportional to the mass of the body.  This means that as the force acting upon an object is increased, the acceleration of the object is increased. then we can also that the mass of an object is increased, the acceleration of the object is decreased. Mathemat

The law of conservation of energy states that energy can neither be created nor be destroyed. Although, it may be transformed from one form to another. If you take all forms of energy into account, the total energy of an isolated system always remains constant. All the forms of energy follow the law of conservation of energy.