The presentation is meant for middle school level science or physics students

1. Middle School Physics
~Lalit Kishore, The Plenum School, HP

2. Importance of friction
 Plays important role in daily life activities
 In walking
 In writing
 In transmitting motion
 Producing energy or heat and sound

3. Advantages of friction 2
 When we hammer
the nail into wood
or wall, it is held
tightly due to
friction the surface
of the the nail and
the other material

4. Advantages of friction 1
 Helps in walking
We push the ground
backward and force
of friction works in
opposite direction (in
forward direction) to
make us move
without slipping

5. Advantages of friction 3
Brake shoes when
pressed against
the moving wheel
rim, the wheel
stops spinning
and the vehicle
stops

6. Advantages of friction 4
We can hold an
objects because of
the friction
between the
surfaces of hand
and the surface of
the object

7. Advantages of friction 5
 We can write on
surfaces because of
the friction between
the writing surface
and ink in the pen;
between the surface
of the white board
and the marker

8. Advantages of friction 6
Due to friction,
when surfaces are
rubbed together,
sound is
produced. Rub a
wire or sand
paper, sound will
be produced.

9. Advantages of friction 7
 When a match stick
is rubbed on a
rough surface,
friction produces
heat to make the
chemical / sulphur
in match stick to
light up

10. Advantages of friction 8
We can climb up
poles and trees
due friction
between the
surfaces, or else
we will slip.

11. Advantages of friction 9
 Motion is transmitted
from place place to
another through
conveyer belts, chains
and cogwheels due to
friction between them.

12. Methods of increasing friction
 By creating grooves, shallow cuts, depressions on
the surfaces, we get better grip. For example the
soles of shoes are grooved for creating friction
between the surfaces
 Tractor wheels are treaded heavily so as not to
allow the them slip in wet soil
 Gymnasts, weight lifters and wrestlers apply coarse
powdery material on hands to get better grip