Answer the following questions
What is streamlining and how it is useful
List the advantages of Friction
List the Disadvantages of Friction
List 4 methods to minimize
the friction in case of two solid surfaces in contact with each other
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Answers
Answer:
1. Friction enables us to walk freely.
2. It helps to support ladder against wall.
3. It becomes possible to transfer one form of energy to another.
4. Objects can be piled up without slipping.
5. Breaks of vehicles work due to friction.
Disadvantages of friction:
1.It always resists the motion, so extra energy is required to overcome it.
2.It causes wear and tear of machines.
3.It decreases the life expectancy of moving parts of vehicles.
4.Since friction is very useful in some cases while harmful in some cases, friction is called a necessary evil.
Answer:
1. As we know fluids also exert pressure called drag.To reduce this friction or pressure exerted by fluids objects are given some suitable shape. Hence , streamlining is useful to reduce the friction or pressure exerted by fluid.
2.Friction is responsible for many types of motion
It helps us walk on the ground
Brakes in a car make use of friction to stop the car
Asteroids are burnt in the atmosphere before reaching Earth due to friction.
It helps in the generation of heat when we rub our hands.
3. Friction produces unnecessary heat leading to the wastage of energy.
The force of friction acts in the opposite direction of motion, so friction slows down the motion of moving objects.
Forest fires are caused due to the friction between tree branches.
A lot of money goes into preventing friction and the usual wear and tear caused by it by using techniques like greasing and oiling.
4.Methods of reducing friction
1)Friction can be reduced by making the surface smooth by polishing.
2)Friction can be reduced by applying lubricants (like oil or grease) to the rubbing surface.
3)Friction can be reduced by using wheels to move objects.
4)Friction can be reduced by using ball bearing between the moving parts of machine.