Question

Write down two disadvantages of the friction and suggest ways to overcome these.

Answer 1

Two disadvantages of friction are:-
1. Due to friction everything wears out with time.
2. It produces heat energy in machines which could damage the internal machinery.

Two ways to overcome friction are:-
1. By lubricating the surfaces in contact
2. By reducing the forces acting on the surfaces.

Hope this helps you!

Answer 2

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$\underline\bold {Question : Write \: down \: two \: disadvantages \: of \: the \: friction \: and \: suggest \: ways \: to \: overcome \: these.}$


$\underline\bold {Question : Disadvantages \: of \: friction :}$


↪ Friction between various parts of machines lead to a loss of energy. Therefore friction reduces the efficiency of machines.


↪ Friction causes wear and tear of moving machine parts.


↪ Friction between rotating parts of a machine produces heat and causes damage.



$\underline\bold {Question : Methods \: of \: Minimising \: the \: friction :}$


↪ Friction can be reduced by polishing the surface.


↪ Friction is reduced in machines by applying oil or grease on the moving parts.


↪ Friction can be reduced by using the ball bearings.


↪ Aeroplanes and automobiles are streamlined in their shape in order to decrease air friction.


↪ Graphite powder is used in machines to reduce friction.



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