Question 15 Marks
How is friction harmful to us ? Write some ways by which one can reduce friction.
Answer
View full question & answer→Disadvantages of friction :
- Friction produces heat which damages the moving parts of a machine. ‘
- Friction produces wear and tear on the contacting surfaces. This reduces the life of machine parts, tyres and shoe soles.
- A lot of energy is wasted due to friction to overcome it before moving.
- Providing ball bearings or wheels between the moving parts of machine or vehicles reduce friction and allow smooth movement as rolling friction is less than sliding friction.
- Oiling or lubricating (with graphite or grease) the moving parts of a machine reduces friction. Fine powder like talcum powder also works as a lubricant to reduce friction.
- Polishing the rough surface reduces friction offered by it.
- Streamlining (giving special shape to experience minimum drag) the bodies of aeroplanes, cars, boats and ships help reduce drag (fluid friction) while travelling through air or water.