Newmicrosoftofficepowerpointpresentation 140405034216-phpapp02

 What is friction ?
 Advantages of Friction
 Disadvantages of friction
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Friction (frictional force) is a
force that acts in a opposite
direction to movement.
The force which always
opposes the motion of one
object over another, object in
contact with it , is called
friction.
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 It is because of the friction
between the sole of the shoe and
ground prevents us from slipping.
 While walking , we push the
ground backwards and the force
of friction acts in the opposite
direction (i.e. in the forward
direction) and prevents us from
slipping. By making the balance.
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 Walking on slippery ground is difficult because
friction on slippery ground is less due to
which we may slip.
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 It is because of the friction
between the tyres of car and
the road which enables car to
move forward without
skidding.
 If there were no friction , car
would stay where it was.
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Newmicrosoftofficepowerpointpresentation 140405034216-phpapp02

 It becomes sometimes difficult to drive and
control car on wet road.
 This is because of water present on road
reduces friction.
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 It is because of the friction between the tip of
the pencil ( or pen) and paper.
 Carbon particles from the pencil lead rubs off
from it, due to the friction, which appears as
black marks on the paper.
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 We can hold a glass tumbler in our hands
because of friction between the tumbler and
our hands.
 Similarly, we can pick up the books laying on
the desk by our hands.
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 Friction also produces heat.
 We rub matchstick against the rough side of a
matchbox, then friction between both of them
produces heat and this heat burns chemicals
present at the head of matchstick and it lights
up.
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 When we walk on the road, tiny surfaces of the
shoe keep on breaking off slowly due to which
the soles of our shoes wear out slowly
 Due to which shoes get damaged and becomes
unfit to wear.
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 Like the shoe tiny particles of tyres also
breakdown due to friction when they run on
road.
 The same thing also happens with the bicycles
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 Brake pad is made of rubber
 When the brakes of the vehicles are applied a
lot of friction is produced
 Friction wears out the brake pads gradually
Before - After
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 The friction between the soles of
the shoes and wear away hard
stone steps slowly.
 Such type of staircase are usually
seen at :
 Railway station
 Old Buildings
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 Friction reduces the motion of moving parts of
a machine . In fact all the moving things such
as (cars , buses, airplanes, boats, ships ,etc.) are
slowed down by friction.
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 New materials with more bumps and hollows
are produce for making car brakes lining.

 New styles for the soles of athletes’ shoes. Its
aim is for runners to run with greater speed.

 Smoothing out Surface
ex. Applying floor wax and scrubbing the
floor.
 Placing a slippery substances between two
solid surfaces
ex. Grease, oil and other lubricating liquids

 Using rotating objects
ex. Roller bearings, ball bearings and
wheels

Newmicrosoftofficepowerpointpresentation 140405034216-phpapp02

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