‘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
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