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# PPT - Matter in our Surroundings Class 9 Notes | EduRev

## Class 9 : PPT - Matter in our Surroundings Class 9 Notes | EduRev

``` Page 1

CHAPTER -11

FORCE  AND  PRESSURE
Page 2

CHAPTER -11

FORCE  AND  PRESSURE
1) Force :-
Force is the push or pull on an object.
Eg:- If an object has to be moved, it has to be pushed or pulled.
Page 3

CHAPTER -11

FORCE  AND  PRESSURE
1) Force :-
Force is the push or pull on an object.
Eg:- If an object has to be moved, it has to be pushed or pulled.
2) Forces are due to interaction :-
An interaction of one object on another object results in a
force between the two objects.
Eg :- If a man stands behind a car, the car does not move.
If he pushes the car, he applies force and the car begins to
move in the direction of the applied force.
Page 4

CHAPTER -11

FORCE  AND  PRESSURE
1) Force :-
Force is the push or pull on an object.
Eg:- If an object has to be moved, it has to be pushed or pulled.
2) Forces are due to interaction :-
An interaction of one object on another object results in a
force between the two objects.
Eg :- If a man stands behind a car, the car does not move.
If he pushes the car, he applies force and the car begins to
move in the direction of the applied force.
3) Exploring forces :-
a) If two forces act on a body in the same direction, the net force is
the sum of the two forces.

F
1
F
2

Net force = F
1
+  F
2
b) If two forces act on a body in opposite directions, the net force is
the difference between the two forces.

F
1
F
2

Net force = F
2
– F
1
The effect on the object depends on the net force acting on it.
Page 5

CHAPTER -11

FORCE  AND  PRESSURE
1) Force :-
Force is the push or pull on an object.
Eg:- If an object has to be moved, it has to be pushed or pulled.
2) Forces are due to interaction :-
An interaction of one object on another object results in a
force between the two objects.
Eg :- If a man stands behind a car, the car does not move.
If he pushes the car, he applies force and the car begins to
move in the direction of the applied force.
3) Exploring forces :-
a) If two forces act on a body in the same direction, the net force is
the sum of the two forces.

F
1
F
2

Net force = F
1
+  F
2
b) If two forces act on a body in opposite directions, the net force is
the difference between the two forces.

F
1
F
2

Net force = F
2
– F
1
The effect on the object depends on the net force acting on it.
4) Effects of force on an object :-
i) Force can make an object to move from rest.
ii) Force can stop a moving object.
iii) Force can change the speed of an object if it is
moving.
iv) Force can change the direction of a motion of an
object.
v) Force can change the shape of an object.
Force may cause one or more of these effects.
```
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## Science Class 9

95 videos|223 docs|135 tests

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