What Are The Advantages And Disadvantages Of Frictions?

Advantages of friction
1. It enables us to walk with out slipping. To enhance friction, it is advisable to use shoes with rough sole while walking on slippery floors. For a similar reason, crutches are provided with rubber tips at their bottom to provide sufficient friction.
2. The breakers and tiers of our cars and bicycles depend on friction to function properly.
3. The ridges in the skin of our fingers and palms enable us to grasp and hold objects due to friction.

4. To prevent patients being uncomfortable in bed rubber sheets with spongy under surfaces are placed over mattresses. The friction between the spongy under surfaces and the mattress prevents the rubber sheet from slipping and wrinkling.
5. Nails and screws are held in wood by friction.

Disadvantages of Friction
1. Production of heat, noise and wear in machine parts rubbing against one another.
2. Heat produce by friction may be sufficient to cause the abrasion of the skin, resulting in friction burn. Rubber tubes such as gastric and duodenal tubes, rectal tubes and catheters may burn or irritate the membrane over which they pass unless measure are taken to prevent friction.
3. Friction reduces the efficiency of engine and other machines.

Friction in many machines ,is undesirable as it represents a waste of useful energy and also heat produced by this force ,may damage the surfaces in contact.Frictions can be extremely useful as in belts drives and brakes.This can avoid accidents.