Friction Mechanics Study Materials
Friction:
In practice, no object is perfectly smooth. When two surfaces are in contact with each other, and one surface tends to move with respect to the other, a tangential force will be developed at the contact surface, in the opposite direction of motion. This tangential force is called “Frictional Force” or simply “Friction”.
Friction Mechanics Study Materials
Role of Frictional Force:
There are some advantages as well as some disadvantages with frictional force. For example, it enables us to walk, ride a vehicle. If the frictional force on floor (or) road surface is absent, then it would not be possible to walk or ride a vehicle. To transmit power from a motor to a machine, belts are used. These belts are working with the frictional force at the contact surface. Disadvantage of frictional force is, it increases the wear and tear of the machine, which leads loss of energy and loss of power.
Types of Friction:
- Dry Friction (or) Coulomb Friction &
- Fluid Friction
Dry Friction refers to the friction which develops between two dry surfaces, slide or tends to slide relative to another.
Fluid friction exists when the contacting surfaces are separated by a film of fluid.
The dry friction is of two types.
- Static friction and
- Dynamic friction
Static Friction is the friction experienced by a body during rest and dynamic (or kinetic) friction is the friction experienced by a body during motion.
The dynamic friction is further classified into
- Sliding friction and
- Rolling friction
Sliding friction is the friction experienced by a body when it slides over an another, and rolling friction is the friction experienced by a body when it rolls over a surface.