This document discusses different types of forces: 1) Contact forces include muscular force, friction, and gravity. Muscular force is exerted by muscles, friction opposes motion between surfaces in contact, and gravity causes things to fall toward Earth. 2) Non-contact forces include magnetic force, electrostatic force, and pressure. Magnetic force pulls materials together without contact, electrostatic force is the attraction or repulsion between charged bodies, and pressure is the force applied per unit area. 3) Pressure increases with decreasing surface area or increasing depth in liquids, as the same force applied over a smaller area produces higher pressure. Liquids exert pressure on the bottom of their container that depends on the height of the liquid

1. Force and
pressure
Type of
forces

2. Contact force
Muscular force Magnectic force
Friction Gravitation force
Non contact
force
Electrostatic force

3. Contact force!
A force generally acts when it is in
contact with an object and such
forces are called
Contact force

4. 01
Muscular force
The force exerted by
the muscles of the body is
called muscular force .

5. when you pick up
a book placed on
the table using
your hands, you
apply muscular
force.
Example

6. Friction
Friction is a force that
opposes motion between any
surfaces that are touching.
02

7. ➢ Friction always slows a moving
object down.
➢ Friction can be a useful force
because it prevents our shoes
slipping on the pavement when
we walk.
➢ stops car tyres skidding on the
road.
➢ When you walk, friction is
caused between the tread on
shoes and the ground.
This friction acts to grip the
ground and prevent sliding.
Uses of friction

8. Non contact force
Force applied to an
object by another
body without
any contact.

9. MAGNETIC FORCE
When an object is brought near to
this field, it gets attracted to
the magnet without any physical
contact.
01

11. .
Example
Magnetic
force is defined as the
power that pulls materials
together.
An example of magnetic
force is how a magnet can
pick up coins.

12. Electrostatic force
02

13. The repulsive or attractive
interaction between any
two charged bodies is
called as an electrostatic
force.

14. ● The electric
charges are of
two types :
● Positive charge
and
● Negative charge

17. Gravity force
Gravity is the natural force
that causes things to fall
toward the earth
03

18. ● Leaves and fruits fall
from a tree
downwards towards
the ground due to
the gravitational
pull.
EXAMPLE

19. EXAMPLES

20. Pressure
Pressure is produced when
force act on an object.
01

21. ● Pressure is
the force
acting on a
unit area of
the object.
Pressure

22. Larger the area of surface smaller will be the pressure
produced by a given force and smaller the area of
surface larger will be the pressure by the same force.

23. Pressure = force
So, the SI unit of pressure is Newton Per meter square .
It is also called “Pascal” which is denoted by “Pa” .
area

24. Look at this
Pressure = 5 5 5 5 5
1 2 3 4 5

25. ● The same force
produce high
pressure if it act
on a small area.
Application involving high
pressure

26. ● The same force
produce low
pressure if it act
on a large area .
Application involving low
pressure

27. ● What is this ?
● Why they built in
very high ?
Pressure in liquid

28. The pressure of liquid increase with depth

29. The liquid exerts pressure on the base of the vessel.
All the liquids
exert pressure
on the bottom
and walls of their
container.

30. ● Liquid exert
pressure on the
bottom of its
container which
depends on the
height of its
column.
The liquid exerts
pressure on the base
of the vessel.