Question

why friction is an evil too

Answer 1

Friction causes moving objects to stop or slow down.        •  Friction produces heat causing wastage of energy in machines.        •  Friction causes wear and tear of moving parts of macinery, soles of shoes, etc.

Answer 2

$\textsf {Friction is evil because of the following reasons : }$


$\textsf{1.Friction between various parts of machines leads to a loss of }$
$\textsf{energy. Therefore friction reduces efficiency of machines.}$


$\textsf{2.Friction causes wear and tear of moving machine parts.}$


$\textsf {3.Friction between rotating parts of a machine produces heat and }$
$\textsf {and causes damage.}$


$\textsf{"Hence friction is a necessary evil"}$