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 perfectly sm
Post a Comment

Heat and types of transmission of Heat

 

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 up quickly and becomes less dense than the cold soup above. The soup which is warmer rises upward, and the colder soup above it comes down to take its place. Pretty soon, you've got a circulation of heat running through the pan, a bit like an invisible heat conveyor, with warming, rising soup and cooling, filling soup. Gradually, the whole pan heats up.

Radiation

Radiation is the way we get heat energy from the sun. This radiation does not require a medium for its transmission such that it can travel through empty space, and this radiation is in the form of electromagnetic energy waves, which travel in a similar way as light or radio waves

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 inertia i
1 comment
Read more

What is the properties of metal?

  On the basis of their chemical and physical properties of metals are defined as elements that possess properties such as, malleability, ductility, sonorous, l ustre, conductivity and mechanical strength. They show the following properties. Malleable : Metals can be hammered into thin sheets. Ductile : They can be drawn into wires.  Lustre : They have a shiny appearance. Sonorous :  When we strike them, they make a ringing sound.  Conductivity : Metals are a good conductor of heat and electricity. Mechanical Strength : It is the capacity or ability to withstand various loads without deformation or breaking.      
1 comment
Read more

What is metal?

Metals are opaque, lustrous elements that are good conductors of heat and electricity. Most metals are malleable and ductile and are, in general, denser than the other elemental substances. or  Metal is a substance which is lustrous, sonorous, ductile, and is a good conductor of heat and electricity. or Metals are materials holding or possessing the characteristics of being shiny, hard, fusible, malleable, ductile, etc. Few examples of metals (materials) are – Gold, Silver, Aluminium, Copper, Iron, etc. or Metals are materials that are hard, lustrous, malleable, ductile, sonorous and good conductors of heat and electricity. Examples of metals are iron, copper, aluminium, calcium, magnesium, etc
Post a Comment
Read more