Skip to main content

What is friction and its types?

‘Friction‘ is a force that resists motion of sliding or rolling of one object moving relative to another. It is a result of the electromagnetic attraction between the charged particles of two touching surfaces.   Types of Friction Static Friction : It is defined as the frictional force that acts between the surfaces when they are at rest with respect to each other. The magnitude of the static force is equal in the opposite direction when a small amount of force is applied. When the force increases, at some point maximum static friction is reached. Rolling friction : It is the force that resists motion when an object rolls on a surface. Technically it’s not friction; its ‘rolling resistance’ since when a body rolls perfectly upon a surface, on paper, there is no sliding friction between that object and surface. Sliding friction : It is the frictional force between two surfaces that are rubbing against each other. It’s a very easy and common concept. It’s hard to find a perfectl...
Post a Comment

Important question : Five question answers of electricity

Physics notes/sicence questions

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 current?

Answer : 1) When an electrical current flows through the conductor, a neighborhood of it's converted into heat. This is often a waste of energy. 

2) The warmth produced can damage the insulation and other electrical components, or maybe cause a fireplace. 

3) Reduces the lifetime of several components within the circuit.

Q5- What are the advantages of heating effect of current?

Answer : The advantages of the heating effect of current.

1) Current heating is generally utilized in heating systems including electric irons, apartment heaters, as well as heat pumps.

2) They are sometimes used to create light inside electric bulbs as well as lighting equipment.

3) It is suitable for use in appliances such as toasters.

Labels:

Comments

Post a Comment

Popular posts from this blog

Newton’s laws

  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 iner...
1 comment
Read more

What is friction and its types?

‘Friction‘ is a force that resists motion of sliding or rolling of one object moving relative to another. It is a result of the electromagnetic attraction between the charged particles of two touching surfaces.   Types of Friction Static Friction : It is defined as the frictional force that acts between the surfaces when they are at rest with respect to each other. The magnitude of the static force is equal in the opposite direction when a small amount of force is applied. When the force increases, at some point maximum static friction is reached. Rolling friction : It is the force that resists motion when an object rolls on a surface. Technically it’s not friction; its ‘rolling resistance’ since when a body rolls perfectly upon a surface, on paper, there is no sliding friction between that object and surface. Sliding friction : It is the frictional force between two surfaces that are rubbing against each other. It’s a very easy and common concept. It’s hard to find a perfectl...
Post a Comment
Read more

Newton’s Second Law of Motion

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 decre...
Post a Comment
Read more