Page 71 - Genius Kidz Prudence Learning Sc-8

8 8 8

Friction

Friction is the force that resists the relative motion. It always acts in the direction opposite to that of motion. Friction is
a kind of contact force and is affected by the nature of interacting surfaces.

Discussion

Jack : My bicycle stops because Suzi : It's friction or frictional
of force and it rides force or force of friction.
because of force. Which is
that force that can bring
Suzi : Stop ! Stop! Stop! Jack….
my bicycle to rest when Even I have to go through
brakes are applied??
the chapter… come let's
Jack : What is friction? How study about friction.
does it act? What are the
factors affecting it?

FRICTION

Definition : The force that resists the relative
motion (motion of one body over another) is
called friction.

Direction of Action of Frictional Force :
Moving bus stops Football stops
Frictional force always acts in a direction
opposite to that of motion. Factors Affecting Friction :

Examples of action of frictional force in our Factors that affect the force, that is acting in
daily life : opposition to motion, include :

(i) Friction allows a moving bus to stop when (i) Nature of surface on which the body is
brakes are applied. being moved.
(ii) Football comes to rest on a floor due to (ii) Nature of surface of the body which is being
friction. moved.

(iii)Walking on a slippery floor with litle friction (iii) Pressure on the body which is being
is difficult. moved.

71