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Friction is a force that acts to slow down the movement of two objects that are in contact. Frictional energy is converted into sound and heat. There are two types of friction: static and kinetic. When friction is powerful enough to inhibit movement between two objects, it is called static friction. When the frictional force is insufficient to halt
The main difference between static and kinetic friction is that static friction acts while the surfaces are at rest while kinetic friction acts when there is relative motion between the surfaces.
Static and Kinetic Friction. If two systems are in contact and stationary relative to one another, then the friction between them is called static friction. If two systems are in contact and moving relative to one another, then the friction between them is called kinetic friction.
Until motion, surfaces have static friction. Once moving, surfaces have kinetic friction. The type of kinetic friction depends on if the object is sliding or rolling. Kinetic friction is less than static friction. A General Rule: Kinetic (sliding) friction is less than static (not moving) friction.
If two systems are in contact and moving relative to one another, then the friction between them is called kinetic friction. For example, friction slows a hockey puck sliding on ice. When objects are stationary, static friction can act between them; the static friction is usually greater than the kinetic friction between two objects.
If the bodies do not have relative motion with respect to each other, the friction between them is static friction and is always less than or equal to the kinetic friction. It is important to remember that the value of static friction is not constant, as the case is with kinetic friction.
Describe the various types of friction. Calculate the magnitude of static and kinetic friction. Friction is a force that is around us all the time that opposes relative motion between surfaces in contact but also allows us to move (which you have discovered if you have ever tried to walk on ice).