Answer each of the following questions in detail:
3. (a) State two advantages and two disadvantages of friction.
(b) What is meant by lubrication? Why is it important?
3. (a) State two advantages and two disadvantages of friction.
(b) What is meant by lubrication? Why is it important?
1) Advantages of friction:
1. no two bodies will stick to each other if there is no friction.
2. walking will not be possible without friction.
3. brakes of the vehicles will not work without friction.
4. writing on black board or on paper will not possible without friction.
Disadvantages of friction:
1. friction causes wear and tear of tyres of vehicles.
2. due to friction , extra energy hes to be spent in overcoming the friction. thus friction involves unnecessary expense of energy.
3. friction force result in the production of heat, which causes damages to the machinery.
4. friction cause wear and tear of parts of machinery in contact. thus their life time reduces.
2) Lubrication is the process of reducing friction by applying oil or grease on the surface . It is important to prevent from rusting and corrosion.
1. no two bodies will stick to each other if there is no friction.
2. walking will not be possible without friction.
3. brakes of the vehicles will not work without friction.
4. writing on black board or on paper will not possible without friction.
Disadvantages of friction:
1. friction causes wear and tear of tyres of vehicles.
2. due to friction , extra energy hes to be spent in overcoming the friction. thus friction involves unnecessary expense of energy.
3. friction force result in the production of heat, which causes damages to the machinery.
4. friction cause wear and tear of parts of machinery in contact. thus their life time reduces.
2) Lubrication is the process of reducing friction by applying oil or grease on the surface . It is important to prevent from rusting and corrosion.
