The document discusses different types of forces. It explains that a force is something that changes or tends to change the shape, size, volume, state of rest, or motion of an object. It categorizes forces as either contact forces or non-contact forces. Contact forces require touching between objects, like muscular force, friction, and pushing/pulling. Non-contact forces act over a distance without touching, such as electrostatic force, gravitational force, and magnetic force between poles. The document provides examples of how these different forces work.

1. Shall We
Learn
Something
New Today

2. FORCE
Chapter 11
Class 8

3. When we go
to the bank or
jewellery ,
We see the
writings on
the glass
door.
What do they
indicate?

4. Let’s Observe the picture,

7. When an Object is Pushed or Pulled ,
a Force is being applied on it.

8. Let’s observe

9. What happens
when a Force is
applied to a body?

12. Force is that
which changes or
tend to change the
Shape , Size ,
Volume , State of
Rest or State of
Motion of the body
.

13.  A Force applied by the contact
between objects is Contact Force.
Muscula
r Force Frictional
Force

14. Muscular
Force
In all these we use
Muscular Force.
As the muscular
force can be applied
only when it is in
contact with an object,

15. Friction
al
Force
Friction
Motion
Pushing Force
In all these force
of friction acts
between the
surfaces.. It is a
contact force &
acts on all moving
objects in a
direction opposite

16.  The Force applied on an object
without Contact on it is Non contact.
Electrost
atic
Force
Gravitati
onal
Force

17. Electrostatic
Force
The Force exerted
by a charged body
on another
charged or
uncharged body is
called

18. Gravitationa
l
Force
Every object in the
universe exerts a
force on every
other object. This
is called
Gravitational
Force.

19. Like
poles of
magnets
repel
each
other
Unlike poles
attract each
other
Objects are not in contact here ,
yet force act ;
So it is a non contact force.

20. Haseena. M.P.