is a good friend:
Due to friction between the floor/road and our feet/foot wear, we
are able to start walking and then stop walking. Otherwise, when there is
no friction, it would be like walking on slippery ice surface.
Without friction all vehicles would skid. Without friction,
the things we hold in hands, will slip through and fall down. Without
good amount of friction, it will be very difficult to climb mountains.
Friction is not so good as:
But friction, takes away energy from moving vehicles. We
need to overcome friction to work, to make machines work. Due to friction
machine parts get heated up, and get worn out. Without friction,
the ceiling fans would not stop after being switched off. Due to
friction, we are unable to move easily heavy object like sofas, cupboards,
tables in our houses.
We need to exert a lot of force. Due to friction the
surfaces get scratches. When there is a lot of friction, there is
sound (screeching, shrill sounds) generated that is painful to the ears.
Friction is desirable, but in small quantities only.